(quoted from post at 16:37:41 05/11/20)
(quoted from post at 12:47:22 05/11/20) pull the oil pan and stick a cardboard under it over night and see if you have sleeves leaking. make sure block is full. head gasket don't look the best.
Agree that head gasket don't look that great to me either. Does not have to be a large chunk out of the gasket to cause a leak.
Case in point would be my BN when I rebuilt the engine in it 30 or so years ago I bought the gasket kit from I believe it was call Central Tractor back then.
It was a Felpro kit so I figured it would be good. Well shortly after getting the tractor back running I found I had a little coolant in the oil.
Did as rustred suggested to you. I had removed the head like you did then I filled the block with coolant and let it set for a few days with no sign of a drip.
Then I started looking at the head and head gasket real close. Don't recall the exact details, it's been over 30 years, but noticed the coolant holes in the gasket did not match perfect with the coolant holes in the block and head.
Did some research in a Felpro catalogue at work and stumbled on a note that mentioned that there was a different gasket depending on the S/N range of the engine. Forget if mine was in the newer or older group but as the gasket that I had installed was Felpro and the part number was on it I took the chance and ordered other part number. Well 30 some years latter I still don't have coolant in the oil!
So even a new gasket that looked perfect could leak then a gasket that looks like that one while I can not say it "IS" the problem I would not rule it out till all other things are checked.