How about numbers? Are there any stampings on the body that should match the VIN or fender tag? How can you tell if it's a rebody? Did they stamp the radiator support back then?
You could order any of the formula S options seperate, so yes, the tach could be in a non formula S car! As for the body numbers, there are none to correspond to the motor or trans, VIN or any other number other than the SO number!!