When you let a well known chivy engine builder order a custom set of pistions, make sure you stress the fact to him that W2 head is not the same as a standard head. Other wise you will end up installing the crank,rods,and pistons to mock it all up, and the find out that the heads pop off the motor because the domes are not cut for the heads.

DON'T ASK ME HOW I KNOW!!!