Trying to verify this motor is original to 1972 vette stingray. These numbers are from the right side front of block just beneath head. The TDL is confusing , as it is not listed in any vette motor options. Not sure why the numbers are overlapped either. Vehicle VIN # is 1Z67K2S515374 . I cant get the rear of block numbers, as car is 300 miles from me. Thanks 