Been lurking for a while, first time to post. Just wondering where the bottle neck is on my engine, and what would make the most improvement. engine info: 428 +.030, 268 comp cam, edelbrock heads, flat top speed-pro pistons, .008 in hole, edelbrock intake, Quick fuel 780 vs, CJ exhaust manifolds with 2.5 inch exhaust. Vacuum runs 13 in at idle, which seems low for power brakes, never have been able to raise it , changed intake from PI to edelbrock no change in vacuum. Didn't degree cam. Street car only no stats other than seat of pants. Was a GTA, installed a sb toploader with truck bell last year.
1966 fb mustang, 351w
1966 f100, 351w