You get no credibility comparing a 440 with a 400.

I agree that am is waaaaay too big, it's something like 234 at 50 lift. I'd go with a Hughes with in the neighborhood of 208 intake at 50.

You don't need duals but as said above a single 3 or 3.5" will do just fine and not cause as many clearance problems.

For the carburetor I'd use a Holley Street Demon 750. If you're using another squarebore Holley I'd suggest the newest model available. They had better metering than the old standbys like the 3310 or 1850. My Street
Avenger 570 is worth 2-3 mpg over a "tuned" 1850. I think it's the part-throttle stuff that's different.

I know what you're saying about the NP435. My NP420 is about the same. Won't pull a hill in Fourth at altitude but Third is screaming the engine at 40
mph. NP445 or 4530 is a way better gear spread. The NV4500 is nearly the same as the 435 with a Fifth gear so in the scene I'm talking about it's just as worthless. The A833 would be better, just not the OD version. You have to look at the gear splits.

R.

PS: Compression and squish would help a lot. The KB 215s with stock 400 rods and a 3.75 crank would work too, you'd have a lot more torque in the midrange where the 400 is lacking.



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