I have a 010 CE block, dated 11 69, with series # after it, and on the bottom, by the oil filter location, a date of K0215 . It had a # written on the side of the block in crayon of #3970647. A guy at the dealership told me it was replacement ' 69 Z fitted block, and that 397# was a service replacement # , ordered through the parts department. Sounds like someone turned a bearing, or worse, and had it replaced under warranty.
Looks like CE 9 5XXXX. It is a bare block though, no crank/rods or pistons, and no VIN. And NO, I don't want to sell it.