The trick here is to "be inside the cooling system" to see where the oil is blowing through. I'm pretty sure testing each passage individually will be the way to find the issue.

I have some ideas about pressure testing the cooling system first though. Trying to get the coolant to leak into the oil would be easier to find.

Odd thing is coolant doesn't leak into the engine when it isn't running.

Could it be just a head gasket?

I'm thinking it has to be between the cam and the rockers.