Blown head gasket

Despite this catastrophic failure the oil is still normal colored and there's no damage to any components. I suppose pulling the head to get that fuel pump stud heli-coiled was the right choice after all.

I still can't source the oil leak though. There doesn't appear to be a hole or crack in the head after all.
The mystery of the leaky stud is going on the back-burner for now. I'm taking the head to have it heli-coiled tomorrow and ordering new head gaskets in the meantime.

**Update** Mystery oil leak was probably one of the gaskets between the head and mechanical fuel pump or the valve cover gasket most likely.