l20b with stock crank. 6 inch rods. Originally I was going to use 85mm NAPS-Z pistons and a ported u67 head with a don potter cam, datsun comp intake, and 44mm Mikunis. But now I have the option of getting a 219 head but I want to stick with my long rod set up but I don't know if there are pistons at work with that set up and if there are, which set up would be more advantageous. Also the link isn't super helpful because I try to enter the current set up im building now and it says that my piston goes above the deck and I know that isnt true.