i used 58cc chambers on an aluminum head with hyupertectic pistons (around 10.5:1 compression) a 208 / 221 degrees @ 0.050 lift lift cam in a standard 350 with forged rods and a billet crank... 2,500 stall with a TCI streetfighter 3spd auto trans and a 3.77 rear gear ... made a good 300+hp and 400+ ft/lbs when all was said and done... listen to theese guys recommendations. what you really should do first and foremost is lay out your build... block, crank, rods, pistons, heads, cam, intake, carb since they all work in combos. if you have the time and money build your car around the engine instead of building the engine around the car... alot of budgets don't allow it but your car will be alot happier on the street if built that way, i kinda learned that one the hard way with my chevelle... thus it sitting in the driveway flaunting it's mystery hole in the oil pan... but when you're four states away from your car it's kind-of hard too tear it apart eh? best of luck in your build. if you need any help with your car in general lemmie know since we're both proud owners of great chevys ^.-