I looked in my GTO restoration guide and it looks to be 41.3 from outside of frame rails. If it does not come close try the inside.by Dave Gamble - Pontiac GTO Forum
Where are you located? I am in Ohio. I have a 66 Lemans that I have been thinking about selling. It's really solid for a Ohio car. There is a motor and tranny but it needs hooked up. It's a manual car. The interior needs some work. If you are interested let me know I might even do some trading on it. My E-mail is daves428@yahoby Dave Gamble - Pontiac GTO Forum