My 65 has 15x7 wheels and if i remember a 4.25 back space. Running 275/60/15's MT ET streets. Also run a 12 bolt out of a 66 chevelle. They are close to the quarters but plenty of room on the inside. They have never rubbed. I believe the rear quarters are similar from 64 to 65 correct me if i am wrong.
I'm running a 64 Camino with 28x9 slicks in factory fenders, trimmed on the outer edges, on 15x8 wheels with 5" backspace. Section width on my tires is about 10.75" and they don't rub. I run 215/75/15 tires on the street with 15x6 wheels since I can't hook street tires anyway.
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