On my 72, there are partial VIN's stamped in engine bay area on top of both sheet metal inner fenders under where the front exterior fenders bolt down. The number is about a foot back from the radiator core support. To see this, you have to remove the exterior fender and scrap away the putty from the top of the inner fender (a wire brush helps also). The number stamped there is missing the second, third, and fourth digit, i.e. VIN=9T11Y123456, stamp=9T123456. The stamped numbers also have small stars at the start and at the end of the number for some reason.