Do you have a part number for those pistons? Every time I try looking those up I can only find 360 pistons in general. Sorry, I didn't mean to highjack the op thread I'm just trying to get the part number of those pistons.
I have a set of good used 9.2:1 pistons out of a 1968 318 with the stock valve reliefs, slated for a 1974 stock bore 318 that I have set aside for building, with a melling 340 cam.