I have a gen 6 vortec 454 9:1 compression, a set of fully ported 390 casting heads 2.19/188 valves. I already have a solid cam & lifter package for this engine but the cam is entirely too big. I want to keep the solid lifters and get a cam that will work with what I have. Im running a dual plane air gap intake th350 trans 2800 converter & 4:10 gears. 750 mighty demon worked.This engine is going a heavy car a 1972 impala around 4000-4500 lbs. What will be a good cam to run in this engine?