After finding all that deep scale on the rear underside of the oil pan, I decided to haul the engine up into the cabin for anticipation of swapping the pan out.
I chiseled the scale, wire brushed and cleaned the area up pretty well. Only to find zero indication of any permeation in the oil pan... no drip/leak/anything after letting it sit for a few hours. There is also zero indication of a leak from the rear oil seal or the drain plug on the starboard side of the pan.
I will let it sit for a few days again to see if more oil drips (as it has every time I've visited the boat for week intervals).
Swapping out a new carb, fuel pump, and water pump while I continue to chase the oil leak...but it's sources seem to be really limited at this point!
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