The firewall body tag will provide info pertaining to what the shell left the factory with. It doesn't give the whole picture. For the complete picture you'll have to send the VIN # to Pontiac Historical Services. < http://www.phs-online.com/ > For $60.00 USD it's worth the price if your questioning the authenticity, or to find out what it was originally equipped with. I had both of mine documented. I also had to find out about a '69 GTO I once owned. Never should have let that one go.
