383 Build

My third issue is this: how much cam can I get away with and avoid having valve/piston clearance issues? or is there an easy way to calculate the interference?

for reference my plan is to use the flat top speed power forged pistons bored 0.060" over, forged rods (not sure which kind yet), a Mopar Performance single plane M1 4bbl intake manifold, either the Schumacher or TTI A-Body headers, and would like to shoot for 450 crank hp.

Most aftermarket piston have enuff clearance built into them for some serious cam lift and durations. The cam required for 450 HP is nothing in lift and duration for the power level sought.

In fact, a modest cam could be used.