BIG Oil Leak Options

[Fastbird]

Ok guys, time to fix this. I've had a LARGE oil leak on my Celi for quite some time now. It's odd though, because I can't find it! Here's things I've just checked again:

Pulled the Distributor, no leak, no sign of leaking, O-Ring is fine, inside is dry.
Valve cover has residue along back side, but it's NOT the leak as the residue is dry.

The only things I can think of are it being either the oil pan gasket, head gasket, or the rear main.

My problem in tracking it down is that I have all the undershields off of the car and it's blowing the oil everywhere. Around the front and back of the motor, up on top of the tranny, ect. I'm leaning on the oil pan gasket right now because there's a LOT of residue along the pan rails and some cracked silicone in spots, but the oil on top of the tranny leads me to think otherwise. Good news is that I'm pulling the pan right now to have a 1/8 NPT bung welded in to relocate my oil temp sensor.

Just throwing a feeler out there, seeing if anyone has any other ideas..........as I'm stumped on this one. I know the distributor o-ring is notorious for leaking, but trust me when I say there is ZERO evidence of a leak there and I've thoroughly inspected it today and the seal is fine.

[Fastbird]

Update: Now I KNOW I got it. After a little more exploration last night, the ONLY leak I now have is a small one from the front of the oil pan gasket. Just need to snug up the bolts some and maybe put a bead of RTV across the front of the pan at the gasket. That cracked hose for the oil return may not be cracked all the way through, and the RTV job I gave the new temp sensor bung did it's job remarkably.

[DEATH]

Update: Now I KNOW I got it. After a little more exploration last night, the ONLY leak I now have is a small one from the front of the oil pan gasket. Just need to snug up the bolts some and maybe put a bead of RTV across the front of the pan at the gasket. That cracked hose for the oil return may not be cracked all the way through, and the RTV job I gave the new temp sensor bung did it's job remarkably.

RTV or JB Weld? The reason why I ask is here at our machine shop we use the JB weld over some critical seals as a further precaution against leakage. Works great - let it set up over a welded seal that already should not leak for at least 24hrs and it'll for sure never leak. Similar heat requirements, material, bung types etc.
That should fix you up permanantly. I'd go ahead and replace the return line as well just on GP's if you think it might be leaking or will in the future.
Hope this helps.