You would also possibly have to correct the valve location as well, and not assume the ones that were the same I-E configuration have the same valve centerline and position on the piston as the 250/292 head has. This is where a true flat top piston with no valve pockets at all would be nice, you can just put your own reliefs in there. When you are degreeing your cam and checking P/V, you will have to center punch (2)pistons to get one for each orientation. You might get lucky and not have to cut any at all either....
