1969 engine VIN discussion

A56 said

I think he's referring to the complete vin being stamped not just the last 7 as is more rule of thumb

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Cast in 6/25/68 (or 8/25/68) and machined and built in 12/27/68. That's almost the middle of the production year. They started stamping blocks in mid year of 68 and all 69's had full vin stamp right? Or is that all hearsay?