Andy, I have only seen VINs stamped on engine blocks for 1965 production (passenger's side front above the
oil pan). Never on 63 or 64. But, the 65s don't have the sequential numbers. My guess is that your block is a production engine, but I can't rule out that it might be a spare engine in Ford's parts department.
Don't know anything significant about scattershield markings. Sorry.
Bob Mannel