Update on my hi-miler Z project

[VetteMed]

Update: I removed the oil filter housing yet again, since I believe the oil pressure light switch is the cause of my persistent oil leak - I've had difficulty in diagnosing it until I realized it leaks mostly while running, not parked. After unscrewing the oil pressure switch, I held the switch with the threaded nose down, and the electrical terminals up. I filled the electrical terminal connector area with some oil, then used compressed air in the threaded fitting. Sure enough, it caused air and oil to spray through the terminals. Pretty much confirmed the leak. Hopefully that's the last leak for a while.

The AC system is giving me fits. I've got a new compressor/condensor/evaporator/accumulator/orifice tube. I added 3 oz of mineral oil to the evap, 2.5 to the accumulator, 1 to the condenser, and around 3 to the compressor. I evacuated the system down to 29.9mm Hg, then added 36 oz of R12 (the factory spec).

Cooling is nonexistent, the system cycles very rapidly, every 3-4 seconds, the low side gets cold but the evap fins do not get cold and therefore the air does not get cold. I disassembled the system today and found over 8 oz of oil in the evaporator, hardly anything in the other components. WTF is going on??