I thought p-pak pistons help function at higher rpm in conjuction with the the closed heads? Was looking at the Egge's, $600 dollars a piston, not doing that. If the difference is minimal then ill let it go. So the power pak block is a 65. The Cuda is a 66. Wonder if I can use those heads and open up my options for an affordable easy to find 4bl intake. Or just strip and rebuild the old 66 block and find a new home for the power pak blok?