Welp... figured out why it's a oil-leaking bitch. This bolt hole in the blower shroud is no more, which means the oil-filler tube is not held tight against the rubber seal in the crankcase. Yes, I have a donor unit... but the shroud looks like it got pooped on by a grease monster and of course, the shroud is where they put the dataplate, so engine model #, displacement, DOM etc are all wrong.
*sigh*mnem