I have a 70 383 we are putting in the kids duster on a budget. I bought a 70 383 motor a few years back that was rebuilt at one time. We put engine in car and had low oil pressure. So engine came out the rebuild must have been a while ago bearings were shot and it has a pretty good ridge at top of cylinders. How much of a over bore can a 383 take? It is .030 now not sure if .040 would clean up. Is .060 safe on a 383.