Found a block only 120 miles away from home.
Standard bore size 4.05".
My machine guy borrowed me his sonic tester, so I took it with me to check the block out. Measured all the cylinders, 12 spots each.
One spot, pointing toward the front of the block, is 0.08", all the other measurements turned out to be 0.14" to 0.24".
Am pleased with that.
Unfortunately, although the guy I bought it from, is the owner of an engine machine shop, too, he did not have a straight edge. So I could not check the alignment of the main bearings.
But, very pleasantly, although the block looks like oil changes weren't on the regular menu, all the water jackets look almost new. Mister no-oilchange must have at least used proper coolant.