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Here’s a post showing what the ´75/76 drivers seat inner track looks like. Is your the same? [WANTED] - 75 76 bucket seat tracks Catalytic converter style And another similar thread about the difference in the 75/76 drivers bucket seat inner track. Converting 75 Scamp to bucket seats

If you’re putting 75 seats in a 75 car then you should be good to go. Double check now to be sure though. It’s the inner track on the drivers side that changed to reflect the added hump in the floor for the cat.

Is your car a 75 model year? Those seat tracks you picked up are slightly different on the drivers side to account for the different floor pan to house the catalytic converter below compared to the earlier year seat tracks.

Hmmm, you talking about a complete exhaust kit with headers? Or only downpipes and back? More context would be helpful. Did you provide TTI with your exhaust manifold castings?

I also went with a TTI downpipe on the passenger side and a non TTI (custom) downpipe on the drivers side. Regardless, tell TTI your manifold casting numbers and car and they will sell you the right down pipes for your application. Here’s my setup: 340 Manifolds on 318

As others have said, 1975 was the first year they could have had a cat as that’s when they modified the floor pan under the drivers seat to fit the cat. No A bodies before 1974 had a cat. However, not all A bodies in 1975 had cats, mine is a 1975 and did not have a cat; that could be a Canada...

I purchased TTI down pipes for my 70+ A body 340 manifolds to connect to a 2.5” mandrel bent kit I already had.

Intake or exhaust manifolds? Your initial question is ambiguous.

You can’t have your cake and eat it too. Headers = high flow but clearance issues. Manifolds = less flow but no clearance issues. Which do you prefer? High flow or no clearance issues? It’s impossible to have manifolds without crappy flow (relative to headers) so don’t even state that.

Exhaust flex pipe should be paired with ribbed or universal radiator hoses. The matched set is important.

How much do you value your time?

The floor pan (on drivers side of the transmission tunnel) changed for 1975 to accommodate the Catalytic converter.

Nice setup and thanks for posting the detailed instructions. It will be handy for others!

Fastback340 won’t ever be replying.......

Ahhh the well known dent in the drivers side down pipe! Looks good. Go for a drive to see if you like the Thrush mufflers. Doesn’t really matter what others think of them as they are on your car. If you don’t like them, replace them with others.

What size/diameter is the exhaust? If it’s 2.5” or 3” then it will be quite close to the torsion bar on the drivers side. Did you replace the starter motor with a mini starter motor? Depending on how the shop did the exhaust install, it could be difficult removing the full size starter down...

Passenger side one should. It appears to be a 273/318 manifold but will still fit. The divers side looks like an e-body manifold; others on here would know better if it would fit depending on if your car has power steering or not.

This is a 9 year old thread bought back from the dead....

So brand new tips, which need no work prior to being installed, range from $65 to $280.

Here’s a summary of when I had 340 manifolds installed on my 318. I used 340 exhaust manifold gaskets. 340 Manifolds on 318

It’s on a 1975 Scamp. The 340 manifolds I used are the later style ones which are not the ones Year One sells. I’m not sure if this will work on a ‘66 A body.

Yup, TTI head pipes are the way to go. Make sure your engine is located as per factory specs so there are no clearance issues. The measurements are on their website but I think (going from memory here) the crankshaft bolt is 5 1/4” from the top of the k frame and the crankshaft bolt is 1 1/2”...

Oh, post that info of it being different up as that interesting to hear. Here’s some info that indicates its the same: http://www.ttiexhaust.com/MoparClassics-Exhaust/MfdCastingNos-340.pdf

Have you considered googling those casting numbers to see what pops up? That would be a way for you to some double checking now that someone has kicked things off.

Left is 3614368 Right is 3418623 Those are the same casting numbers that were used on the 340 A bodies starting around 1972 up to when the 360 A body production ended a 1976.

The mental bit of knowing the exhaust flows better has me believing the car has a bit more pop. However it's really hard to tell from the butt dyno if it actually is faster.

I'd recommend a mini starter. I bought one listed for a '93 Dakota. Check out the starter motor size difference in this thread. 340 Manifolds on 318

Thats a picture of an engine bay from Australia.... everything is on the other side down there.....

Like someone already suggested, I used Eastwood high temp manifold paint too. I've only had them on the car for a week so I can't comment on how long it will last before it starts to rust.

One of the Weiand's is almost an exact copy of the LD4B but I dont recall which one. I looked at buying a new Weiand if I couldn't get a good deal on a LD4B.