This is a 283 diesel. Anyhow 283 gas engines also have pressure lubed rods I think you are thinking 265. Anyhow anything with 7 mains has pressure fed rods. I need to punt for a little bit because he has a replacement block with out the plunger (pressure regulator valve in the front. I never worked on one of those. I have a bulletin on that but I have all that information stored until this winter I hope.I still think the thing to do is take the pan off get a leak detector and see what is going on.