Had to slip out of work to check this out. So the numbers were on the passenger side engine, just above the oil pan and the 6 digits match the last six on the dash VIN (numbers matching). Everything about the car screams 72 from the dash, emblems, marker lights, rib on trunk, grille, hood and hood hinges, bumpers. As mentioned the 340 is stamped Jan 18 71. I suppose anything could have happened between 72 and the early 90s when I got my hands on it and redone as a 72? From what I see you can’t pull the year from the VIN. Anything else I can check to confirm it may really be a 71. Maybe the motor and VIN pulled from a 71? Thanks again