Chrysler used a 10,000 day calendar starting in July of 61.
http://maxwedge.com/articles/10k.php
Day 3364 is Tuesday, October 13, 1970 as stated. This is the date the engine was "assembled" at the engine factory stated. Then it was sent to the car plant and the vin stamp was added when assigned to a car. The pan rail VIN for a Hammy car with this engine would be 1BXXXXXX 1 being the model year 1971, B car plant is Hamntramck then X the last 6 of the cars vin.
