71 Plymouth Duster 340
Since the fender tag says that the car is a 1971 H code 340 Duster, what happened to the rallye dash? The one picture of the interior of the car reveals a standard Duster dash, not a 1971 Duster 340 rallye dash.
Also the VIN should be stamped in the radiator support (as previously stated) and along the rear parcel shelf.