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I don't thing there is an adapter but you can but the 2 1/4 flange: TTI Exhaust Collector Flange

Looks correct to me

Here is a thread on the topic: 340 HP Exhaust Manifold Bolt/Stud/Nut Locations

Do you still need pictures? Cause my '69 340 has the manifolds bolted to it with reproduction hardware. But its under a table with blankets and plastic piled on it but I can get pictures if they still needed.

If you zoom in you can see where the H Pipe bulges just after the trans cross member. The TTI head pipes slid in back there. I welded grinded the H Pipe to collector pipe connection which is forward of cross member hard to see where those join....

The TTI 340 manifold head pipes I used to have on my car ended just past the trans cross member. When I swapped to TTI headers a 8 - 10 inch extension from the collect was needed to hook up to where the manifolds were

Yeah everyone should run headers blow the doors off all the cars with manifolds. Every car is faster with headers. Every car with headers is faster than every car with manifolds. So stop smoking clear get headers. Puff puff pass....

You can get a custom cam ground to reduce the losses that the manifolds cause. Most off the shelf cams assume headers hence bigger losses with those.

The TTI head pipes are mandrel bent right off the 340 manifolds no pinch. They flow like giant over sized sewer pipes. TTI routes the head pipes differently depending on auto vs 4 spd. But either way a full 2 1/2 and no exhaust flow choking pinch. Dynomax Ultra Flo mufflers are straight...

Gains depend on cam profile, head flow, head flow numbers, stroked or not, and dozens of other factors. A stockish type low cam lift stock port engine will have modest gains like you are thinking. A stroked small block ported aluminum heads 600 lift cam ect will be gaining 50-60 or more hp...

They have fellro 60025 listed on rockauto clearance priced.

This would prob work: Vibrant Performance 1456 Vibrant Performance Exhaust Flange Gaskets | Summit Racing

Modest gains on milder engines yes. With a large cam high flow head and/or stroker then headers can gain 50 hp or so over manifolds. So how much hp headers gain depends on engine combo. If you go with TTI exhaust with manifolds then decide later want headers you can pull head pipes out of H...

The passengers side '71 340 was more restrictive lower flowing then the '68-'70 pass side. '71 drivers side flowed as much as the earlier ones.

The '85s had two tail pipes but a Y pipe off the engine that split back into two. '86 was first year for true dual exhaust on the fox bodies.

TTI headers, TTI 2 1/2 inch H pipe, Ultra Flo mufflers, TTI 2 1/2 inch tail pipes with tips, no drone. Ultra Flo on my car not loud at all unless I go wide open throttle and even then the roar from carb sucking in air is much much louder then the exhaust. Dynomax mufflers that are offset in and...

Yes and had to make sure cars could be thrown together quickly on the assembly line and not have pipes hitting frame, gas tank, leaf springs etc. So the small pipes with pinches restrict flow to some extent but were ideal for a production car assembly line purposes.

Cool to see to original style tail pipes being reproduced for the folks that want that original part.

Didn't '69 have the different gas tank straps then '68 maybe thats why tail pipes were different?

So '68 '69 Barracuda and '70 Dart use same tail pipe but original Barracuda tips had an extra bend in them for more tilt up?

Reminds me one of these days do something to get my reproduction tips on TTI tail pipe to tilt up for correct look....

Can't speak for the various dyno test comparisons done over the years. But I think a more valid comparison is using an unpinched driver side head pipe when testing the manifolds. Also passengers side heat riser could be partially stuck closed too which would choke power too.

With stock manifolds the driver side head pipe, at least the stock style pipes, are severely pinched down to clear the torsion bar. TTI routes the driver side pipe differently to get rid of the pinch. So in a lot of cases some of the gain with headers is alleviating that pinched head pipe.

Most likely Chrysler went with the undersized tail pipes so when they slapped the cars together on the assembly line less chance of pipes hitting gas tank or frame ect. Thats my guess. And like someone said above exhaust gasses cool as they travel rear ward and require less pipe size to flow...

I had to custom bend some trans lines to route around the header. Mine route down by the oil pan where the header tubes are to avoid contact with the header tubes.

This is TTI head pipe driver's side. This was for a '69 340 exhaust manifold. It is routed like shown in Treblig post above. TTI provided instructions for modifying the auto kick down linkage (cut reweld lever to narrow) is what I remember. Your engine must be centered/located per TTI specs...

The TTI head pipes bolt to the stock 340 manifolds no problems. On driver's side they came two ways: one for auto cars and a diff one for 4 spd cars. The pipe is routed differently then stock to avoid pinching the pipe. Good exhaust pipes are never cheap....

I have Ultra Flo mufflers on my car for several years now no issues.

When I had my stock 340 in the car I ran those same head pipe. I ran a mopar performance mini starter and that freed up some room. You can probably get similar or the same starter off a Dakota from a pick and pull (I don't know years sorry). I remember having to cut and reweld the kick down...

If its a '72 or earlier style motor mount you can shim between motor mount and k-frame to raise the engine a little bit. I have two shims on one side and one shim on the other to get my headers to fit. The factory k-frame specs were very sloppy which causes a lot of header issues....