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This. You have plenty of spring imo. My buds 340 crossed the finish line a hair over 7k with a similar setup. 273 rockers and ran a Torker to boot. :) As far as the oil mods, as long as have 6qt+ oil capacity, i don't think it's needed.

SMH......No one has asked how stock or old the short block is. Can you say timing chain?

Aren't all these posted torque charts run at WOT? To me, drivability means nice/smooth bottom end acceleration with the least amount of throttle opening. I'm still sticking with my ''big inch/long arm theory.....:)

My Uncle bought a new red 71' 198ci in Maryland that mirrors yours almost exactly except it was a 3spd.

Imo, big cube long stroke engines with mild cams deliver the best compromise. Anyone that's driven the older stock GM 455's knows what i'm talking about. Since we're talkin A bodies, i'd build a 9 to 1 low deck BB with a 4'' plus crank, iron heads, 220ish cam and the regulation bolt ons with a...

Try and borrow one or get a cheap stock replacement to test before buying a good one.....if you really think that could be the problem. P.S. Just saw the pic in your welcome thread. Absolutely beautiful car...:thumbsup:

Coil itself could be the issue...

Probably has a 245 head on it. Love to see the piston dome. Gotta love those willing to put that money into a Sportsman build these days.

Buy the one that has the most original parts and the least amount of rust. Both are rare these days.

Fit...Yes. There will be some port mismatch, still a nice gain over a stock 2bbl intake.

Did that thing have a smog pump and adj. rockers...wow

I believe all the AFB/AVS carbs had similar base plates. You may need to look at the real early WCFB's if that's important to you.

I'd start at .040 if it was mine. 45 should be fine thou.

If the 67's are 920 castings, they have equivalent chambers to your stock heads. No perf benefit, but allows the use of any small port late intake.

What intake do you have. Some have a port on a runner. Not perfect, but better then nothing.

I'd look at the remote filter. Years ago a bud with a 428 Fairlane lost around 30lbs after installing one.

What list number carb do you have. Don't remember the 4780 having a secd PV. Regardless, your way light on the secd jet.

I was leaning towards the Oregon, but just remembered you're using the low gear set so i would go with the MP myself as i believe it would give a little more mid range torque. Just throwing out another opinion.:)

Do you have plans for it. I wouldn't get it to stick under the workbench. Looks like the pass side valve cover has been off.....maybe looking for sludge/damage. Like said before, if it spins, probably a good deal.

Love your work John. :thumbsup: As a complete novice on intake porting, what would happen if you shortened the dividers a bit.

Guessing it's a small tire car. How much rpm are you missing on the big end. Maybe retard the current cam a bit to knock down the hit and give a few rev's up top. Then again if you're cyl head limited, while that new cam may raise the peak power, i'm not sure you will gain much for average power...

Do you recall what gear ratio was in the car? It was a 3.23...

Can't believe no one asked about a carb/intake or exhaust upgrades...:) I was gonna suggest a Hughes Whiplash....https://www.hughesengines.com/Index/products.php?partid=30170

Very cool. We get a few similar out of Joint base Charleston now and then about 5 miles from us that i can't identify, but love watching them go by. :thumbsup:

70' 340 Duster....Factory installed converter with stock engine other then a Hemi grind cam and 750 carb, foot braked to 2200. May have flashed a hair more.

Of course there will be some drag.....spinning the r&p and driveshaft. Curious the reason/problem why you're asking?

I'll throw one out there.....Too much preload on the valves?

To give you a little bump..... I'm no expert with Magnums, but i believe the NZ castings were superior before they moved to China. That said, if i recall, the intake ports were in the 170ish range. Not sure what your goals are, but 400hp with a 360 is easily available. Now 500 would take some...

I think you could teach some a lesson. :) Your original build is about spot on imo. First off, that car with a small block is not near as heavy as it looks and makes a good handling ''road'' car. One of my early encounters with Mopars was with a college student neighbors 69' 318 Charger in the...

@Princess Valiant