I am looking into this 87 Grand National that is for sale. I don't believe that it is a true GN. I have the RPO codes from the trunk & the WE2 code is NOT present. It is also lacking the G80 code (but not all GN's have this). I think that it was a turbo charged Regal and that someone swapped the badges & interior pieces to make it appear to be a GN. I have the VIN # (1G4GJ47A3GP445735). Could somebody run it for me? How else could I know for sure? Thank you,