I picked up a parts car 67 skylark sports coupe, california car, straight and clean. I have a 67 GS400 Sports coupe. frame off restoration in progress but...My 400 body is roached. do I need to cut off everything from the fire wall back and it's still a GS400. Is it all in the body tag and the paper work? How much is to much? I want to know for me, it's still a GS400. I'm sure there's more than one opinion on this deal. Whata ya think?