Ok thank you! I've been reading that along with head bolt info here.

The oil is draining from the bolt right now, and going to take off the filter when that's done. It looks a little thick/dark but no gloops in it that I can tell yet. Will double-check and stick something in the oil pan drain hole to make sure no gloopy oil on the bottom. I REALLY don't want to have to pull the oil pan -- I did such a nice job sealing it up only a few months ago. But will if I must.

The suspect bolt hole in the back corner on the drivers side sat overnight without me messing with the block at all ~ and it was perfectly dry & clean inside this morning when I checked before draining the oilpan ~ WHEW!!!

Super appreciate all the tips I can get, trying to not rush it though I sort of want to, lol, I miss driving it.