[exitwound]

I got a hold of the original owner of the engine who believes it's a rear main seal installation error, rather than the oil pan gasket like we thought. I think I'm going to go with his conclusion that he installed the rear main seal flush with the engine casing and not indented into the recess.

Doesn't look to be balance shafts. They appear as dry as can be, both the sides and the rear plugs.