Well just like I figgered... I pulled the pan off and the rear main cap and that plug is in fact installed. I guess I don't know which way to turn now.
I did manage to pull the drivers side rear oil galley plug and it was not a restrictor like I said. I was unable to get the other two on the rear as they strippped DAMN! but I think it's safe to say that there are no restrictors in there. Should I opt for a new set of lifters? I was thinking of getting a new cam anyway. Any thoughts? Anyone. What else could it be???