I worked for mother mopar for years. It was not uncommon for the above situation to happen. Engines could be 90 to 150 days built prior to installation. Remember that 72 was when the "EVIL EMPIRE(EPA)" reared its ugly head. On another note, RRR was pretty damn close on his steel/cast crank date. Below is an insert from the 72 parts book. Sorry for the way it reads. I am not a photographer. Dated April 20,1972.
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