Low oil pressure
I was a little struck by the fact that you stated your engine was bored .080 over. I was under the impression that a 383 is a 350 block that is .030 over with a 400 crank and flywheel...bringing the cubic inches to 383. If your block is .080 over you may never get good oil pressure. I believe the limitations on boring a 350 block border around .060 and that is pushing the cylinder wall dangerously close to being to thin. Those cylinder walls are surrounded by water jackets, ports in the block that allow coolant to dissapate the heat of the cylinders. Are you certain of the bore?