Ok Plan B or is this plan RB... I bought another pile of motor parts off a guy named Bigfoot. One of the motors is a 1972 413, the block casting number is on the bellhousing area,kind of where a chevy would be.I pulled the crank and rods to use with a new set of pistons in the 440 with the 915 heads.The cranks is forged,but I can't find a casting # on it ,the rods are LYs,. Anybody have any idea's on pistons , Jegs has Ross pistons on sale,but I have never used them.