My 70 L78 Nova has a CE replacement block. Casting date 5/25/72, CE360285. This car had a warranty replacement shortblock installed in the summer of 1973. This seems to make sense, the block was cast in 72 and then asembled with the 73 year code and 60285 in sequence. I know that the engine was replaced at the dealer because the original owner had all the details. I have never seen a CE motor with a vin, but then I haven't seen everything. Hope this helps. Tom