carb
On my buddies 421 with unported 235 Pro Topline heads, we run Super Victor with 4500 base and Rupert alcohol 1050 Dominator. .690" lift cam.
At 2600# plus driver it runs 5.90's with M5 and 6.00 with M1 fuel. 60's are 1.25
You may get more help if you ask this in the Forum for Carburetion.