Cam/Head Swap Disaster.......

My thought on the hi oil pressure is the bypass valve was stuck for whatever reason.

If and when you tear down Jake, make sure to note bolt locations, which holes are wet vs dry etc.
Also as RRR mentioned the oil mixing with coolant may be the cause of it coming out past filter?

"If it was mine" what I would do at this point is run a pressure test on the cooling system with the spark plugs out.

But Rusty is Right on this one, pressure test the dry cooling system and see where air is leaking to. Pinpoint your leak before proceeding.

Well, I had a hunch that after all this talk about the intake water passage not sealing I decided to test it since there was drips still coming out of the pan I pulled all the water out of the intake and the drip stopped immediately. Now, I’m going to pull it out tomorrow because I believe now that the oil pump switch was wrong but my fear at the time about finding car pieces in there were legit. I should have inspected it closer and maybe it would have been something I would have caught. The machine shop i took it too had the wrong amount to take off on there but promised that they did it to the correct number which was .015. I believe I can get a thick intake gasket to resolve this issue because it’s going to be hard to find another LD340 for 125$. Thanks to everyone for their experience and insight. I’ll check back with pictures in the coming days, also, I used straight water and no coolant so hopefully that will have payed off in the long run.

Jake