I am getting a moderate amount of oil leakage focused at the rear passenger side of the engine. It tends to accumulate on the frame rail on that side, but it’s hard to pinpoint a focal area. The highest and farthest forward point I see oil is the lower passenger side spark plug guide bracket.

My first though was valve cover, but it is not wet. Second thought was rear main seal, but why would oil chiefly accumulate on the passenger side, and show evidence ahead of the block/bell housing seam? I should note that there is no flywheel dust cover installed and no gasket/seal on the starter where it bolts to the bell housing.

So, does this scenario sound familiar to any experienced y-blockers out there?

1954 Crestline Victoria 312 4-bbl, 3-speed overdrive