I've had a slow leak for years at the engine/transmission area and hoped it was just an oil pan gasket. After replacing the gasket with a rubber Fel-Pro, it continued to leak near the same place.
I pulled the transmission (quite fun by myself) and clutch/flywheel only to find that the rear crank seal was not the source. After cleaning it all and letting it sit overnight, I had a small amount of oil above the pan/gasket, but not a drop from the seal. It looks to have been replaced when the previous owner had the clutch done years ago. After wiping it clean again, I carefully tightened the 3 oil pan bolts just a bit and saw oil ooze out from these two areas:
Would replacing the two 'side seals' solve this problem? Should I bother replacing that main seal while its accessible? Bummer I pulled the transmission only to find this out, but it did give me a chance to clean 40 years of gunk off it. I can adjust the parking brake assembly, too.