In addition to the VIN I have found date codes on the block in three places: in the casting of the part number, on the pan surface, and on the cylinder head deck on the left front corner. Note the casting date of 4M4 and the machining date of 4M17 B. The car has a build date of 12/30/64, the block was cast on 12/4/64 and machined on 12/17/64. I believe Bob Mannell would refer to the B as second shift.
For those of you that asked, the double roller replaced the narrow stock HiPo chain assembly when it was owned by a PO. This is a fairly common practice and requires adjustments to be made during balancing of other components.
It is important to avoid machining the deck or pan surfaces unless absolutely necessary to preserve the date codes.
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