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Hi Im looking to do a budget street build on a 1972 455 looking to change the 7M5 heads for 6x4 or 6x8 Heads! I am thinking of using the factory pistons and connecting rods but I have to inspect bore and piston assembly. I am looking for some advice! 9.5-1 max cam suggestions rocker assembly. I was hoping to use factory style GTO chrome valve covers! thanks its been years since i have rebuilt a motor never modified one.