340 identification

crackedback said

73 Model year engine.

I'll guess out of a Charger

I see an HM designation in a picture which would be 1972, but the VIN appears to start with a 3 = 1973

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Cool thanks! And I’m assuming from the casting number it’s a 71 block right? Would the model year mean it has the cast crank or would it have a forged crank from 71?