[CHRIS POTTER]

I have yet another set of suggestions to add. I also have 72 4bbl heads. They have been milled .070" ,yielding 10.25 compression. I have a Lunati bracketmaster cam, hydraulic, not roller, 750 Holley vac secondaries, with a 65 power valve. I have both intake and exhaust port plates, way better than without, ran it both ways, but, didn't try exhaust plates only. My engine on the the dyno showed 378 hp, and 401 ft lbs of torque. I would consider the Edlebrock carb, as I have blown 2 power valves out with the "new" "blow proof" Holley carb! Yeah, right! I know you're looking for more than 400 hp, but this is what I got, and, although I want more power, I've decided the car is pretty lethal as it is. Also, my jets are what came with the 750, tried up and down, went back to what it was shipped with. Sorry, can't remember what size they are, but get 15 mpg if I don't push it.