I can see it coming from the pan seal, rear main was dry, going to reseal all the galleys back there and if I can get the cam plug out and silicone that in instead of the gaskasinch stuff just to be sure. Going to go over everything.
When doing the pan i do every bolt as well the cam plug spun up a piece of ally & cut an o'ring into it these days i get them up to temp on a run stand then fix all the leaks before paint saves a lot of headaches .
Have you thought about putting a distributor & coil on it to prove each part
