I agree. Oddly enough I could see some writing on the fender when looking behind the heater box, but I couldn’t see the whole thing until I removed the fender. The car has never been apart before from what I could tell so it’s probably fairly rare to find marks such as these. It would be interesting to see if any other original 409 cars never been apart would have similar markings? There are other numbers such as “14” at the bottom corner of the same fender in the photo and numbers on the firewall”3,2” and others. Does anyone know if GM had build sheets stuffed under the dash like fords did?
thanks
Bart