WkillGS, they have an 8" wheel with a 4.5 backspace, that would move the outer edge in a 1/2" and probably make those 245 tires look better. Opinion?
I run 255/60-15's with Buick 15 x 7 wheels on my 66's. Those wheels have 4-3/8" backspace, and tires are 'snug'... meaning they may rub the fender on one side if the rear isn't perfectly centered. There's more room on the inside near the frame.....so a 5" backspace would be near perfect for a 7" wheel, or 5.5" for a 8".
65's have the same frame dimensions but there is a little more room at the fender lip than the 66's, I'll guess there may be an additional 1/4"-1/2"?
The 8" wheel with 4.5" b.s. is still about an inch from the ideal 5.5". It 'might' fit your 65. Do you have the stainless wheelwell moldings? If not, you can bend up the inner edge of the fender lip for more clearance.
Maybe the guys here with aftermarket wheels on their 65'scan post their rim width and backspace!