Mine turned out to be the rear main seal. The original seal was just what came with the gasket kit. I took the recommendation from Ironmike on this forum and ordered a seal (I have to look back and find the vendor's name). It had a dual lip and after installing it I had no leaks from the main. The dual PCV I ran is no longer necessary but I have a 1" spacer under my Fitech fuel injection and it had a port there that I connected to and the other PCV went to the throttle body. I would think that you probably could just run a tee to connect both pcv valves. Give it a try, it sure can't hurt.
