We’ll have to agree to disagree on that one....I saw many new 389 GTO’s in 64 and 65.
The ‘65 was cut way back from the ‘64, engine-wise.
That was the GM anti-horsepower directive that put the big 427 chev motor back in the warehouse until it was allowed in the ‘67 Corvette.
My next door neighbor had a ‘64 GTO, and I used to tune it for him. It did a solid 10 second 1/4 mile, even with his awkward hands on the controls. The ‘65 was a real let down after driving that ‘64.