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Casting date should be straight above the casting number you showed. If it is the original block for your car, your cars last 8 or so numbers of the Vin should be stamped on a pad just above the oil pan rail. (Typically 2(letter for assy plant)xxxxxx) The "2" would be for a 1972 car.
Edit: Quick bp's location info is better than mine.
73-78 block according to what I find online. However (and I am guessing here) I would say since the 3 indicates a third cast/mold it is a later block. If the date code is 72 then I stand corrected but many things could have happened when or shortly after the car was purchased. Small crack in the block (leakage) would have prompted the dealership the replace possibly months after. Who knows, but again that is my guess.