i called competition products tech line, they could get pistons for a 4.375 stroke and 6.535 rod, i thought you could get any piston as long as it fit the compression height, piston skirt might hit crank, i get a discount on machine shop work, my brother and I run a used car dealership/ auto service, he sells cars and i fix em, i'll probly just buy some new, set up, aluminum heads$$$ i'd trade my wife for a set of aluminum heads........maybe

thanks for your help