Well, no help with the '64 GTO. Let's move on to '65.
I love this Knafel '65. '65 was my favorite body style. My 1st GTO ride was in a '65. But I wasn't able to buy a car, til '69. So, I bought a '69.
Anyhow, according to the writing on this '65, Bill Abraham was the NHRA nat champ in it. And Arlen Vanke set a nat record in it. Must have been a pretty quick B/S car, at the time. That would have been a Tri-Power 389 car, I assume.
I'm sure there were '65's running at local tracks, all over the country. Don't know of any other quick ones, specifically. Maybe you guys can help with that. I did find a pic of a '65 auto. Looks like one that would not have passed tech, at a big race. But local tracks let a lot of stuff slide.
Also found a pic of one that appears to be at a small track. Probably many hundreds of '65's ran at small tracks all over the country.
https://www.mecum.com/lots/SC0509-79...5-pontiac-gto/