Having been there myself, I would be surprised if that thing lasts much longer with just a new pump and shaft. I would bet the main bearings are down to copper. Mine was not knocking at all, I heard increase valve train noise at a stop light, saw the gauge, shut it down. I state this negativeness to help you prepare for the worst. I hope for you, I am proved wrong, but copper bearings was my treat after a lost oil pressure incident. I have my fingers crossed for you.