I've been thinking about this one. A spun bearing shouldn't change your oil pressure unless it completely let go of it. I would try a few things before I tore it apart. I would pull the distributor to see if your oil pump is able to turn and then turn it manually to see if you have anything. You can unscrew the filter and put a bucket under it to tell. If you have oil then tear it apart. No oil, reprime your pump and see what happens with oil. Your Dad may have just ran it dry. If so the suggestions I made cost you nothing to try. This is a 1.9 motor isn't it?
Just tryin to save you some trouble
Just tryin to save you some trouble