Opinions sought on odd engine knock

Well, it never has not quieted down, and just once did it have any noise past the oil pressure coming up. But it is coming out this week just for precautionary reasons f not a whole rebuild.... if this cold WX will relent a bit.

It is just a shame that we could not keep this never-torn-down, fully original engine going happily along. But any driving beyond just rolling around 1-15 miles from home base seems to indeed be risky. We may find more than just a 'rough' bearing.