Looking at a 1965 C30 - input appreciated

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Doh! Looks like it IS the rear main leaking. I put on the vented oil cap, changed out the gauge connections, ensured the pcv was working as designed, and it still leaks when fully warmed up. It is a much slower leak than the first time, but still a constant drip from the rear main area. I checked and couldn't see any oil coming from anywhere else.

It didn't start leaking until I drove it about 10-15 minutes, and I noticed the oil pressure dropped to about 5psi.

It doesn't leak until warmed up, and stopped dripping when I shut off the engine.