Am I reading this right?, you're saying that "all 1967 GT500's were "S" codes? I know that all 1967 GT500's are 428 cars, not the "S" code 390.
It may be just the way you worded it. Knowing it wasn't a real Shelby.
Yes, all 67 GT500 were serial numbered from the Ford plant as an S-code fastback. Even though Shelby installed a 428 in them. Shelby had his own serial number installed on the fender. Sure would have been nice to see a couple small holes near the serial number.
Correct. I recently sold a 68 1/2 Cobra Jet Fastback. It was a real early car and the serial number on the fender apron had a blank where the engine code goes... Don't know if you have ever seen that, but I thought that was kinda weird. The early cars were like that... The dash Vin plate and door tag had the R in the serial number.