I just bought a 1969 GMC I need help with the vin number to be sure the truck is org. It has a 350 with a 2 barrell carb. 3 speed on col. man. brakes and has the longhorn bed.
I don't believe that the VIN will help you determine if the truck is original. Look at the sticker on the inside of the glove box door, providing it is still there, which should give the vehicle original build content.
The VIN is located on the driver's door latch pillar (B Pillar).