28Eliminator

Pull the distributor and get a priming tool to spin the oil pump rod over with a drill to see if you get pressure. The drive rod could have broken, or you should be able to see where all the oil is going with the pan off. Could pull a few rod caps to check bearings. If I had it that far apart I would probably at least change them and maybe the mains anyways, since they had very little oil temporarily.
Good luck!