427 0.60 over this is not to good of a comb power brakes ??? you were going to run this street strip ??put more cam in or take the piston s out. is this some thing you are driving every day? if so take out the pistons if not put a bigger cam in it and get it up to 12 to 5 race gas is the same for 11to1 or 12to5 and forget the power brakes think i would sell all of it or the mass and make a496 or 468 you can make a pump gas monster with the 781 heads and not spend big $$ on gas