We had a lot of success with the .040 over 360 with the 72' 340 pistons. I had a set of home ported J heads and the mopar .590-312 cam. Stock oil pump and a moroso pan. You could find the 360's all over the place for $200-300 back in the late 70's early 80's. We ran low 11's in a Duster, 904, and a dana w/ 5.13 gears. When we got rich and bought a used W2 top end we were able to run 10.80's. Was a blast back in the day.