I finally got the oil line reconnected to the block. I cranked on it a few times to build up oil pressure. It started up and ran well, the oil pressure was good. Drove around the block and it seemed to have a miss. The oil pressure dropped to 40. Once you release the throttle the oil pressure goes down to 20, and of course it feels like it's gonna die. At one point there was a very loud noise that sounded like the squeal from a belt, but I its more like metal-on-metal somewhere in then engine. Is this the oil pump or worse?