Identification numbers on front of 273 block

Dana67Dart said
Is the 117316 in your VIN or SO number?

In the states, the first letter indicates model year "A" being 65 model year "B" is 66 etc.

Is the date of 6-7-66 the stamped in date on the front of the block or the casting date?

Engine build date of 6 of 66 is a end of production 65 year.

Doesn't the 66 ,model year run from October 1965 (month "A"), November 1965 ("B"), December 1965 ("C") and then January ("1") etc. to September ("9")? So a June 66 production date probably was end of the 1966 model year, correct?