I'm starting my first build and it's a BBC 454 Mark IV that I just got back front the maching shop bored 40 over. Starting with the lower end of the engine, I'm looking to purchases piston rods and piston heads but get asked about rod length and piston head shape and I have no idea from there...

You have probably had a million of these questions but here is another: I live in Salt Lake City Utah, Elevation about 5000ft. Have a 1970 Chevelle, 454 with Large oval port heads, Automatic Trans, 3:73 rear posi, engine is bored .030 over, large cam and a Performer intake Manifold and Hooker...