I really don’t want to send this to the boneyard, but this is worrisome. I see a dripping off some edge of the block just above the starter, I see nothing in that vicinity above that could be leaking coolant.

The only possibility I can come up with is a bad freeze plug in that vicinity. Not sure how many freeze plugs are on these engines. I had a couple of them replaced some years back. If there is a freeze plug in this vicinity, looks like it would be hard to get to.