Yeah the VIN tag should be rivited on the drive side of the instrument panel, you can also find on the drivers side rear top of the frame rail right where your rear exhaust hanger for the exhaust is where the tail pipes connect to is a stamped partial VIN which will have the last 8 characters of the VIN if the GTO still has its original engine the partial VIN same as the frame should be stamped on passenger side of the block near the timing chain cover thats how my 69 GTO has and even the transmissions have partial VINs on them websites that can help you find information of VIN tags is
GTO Alley! or
Pontiac GTO - The Ultimate Pontiac GTO Picture Site and other websites
