Neither of those pistons look like the stock 5.7 piston. There is just a very gentle curved dome and no notches. The pistons would be far enough below deck to prevent a colission, I realize it will be a little bit of a low compression deal but I have rings bearings pistons rods a block crank, some magnum heads an XE268 cam 1.7 rockers M1 single plane intake, so I could throw a motor together real quick that could make a few hp plus the Hemi parts are very light weight so it should rev very easily.