For what it's worth, I have 9" W x 17" diameter Year One aluminum Rally II wheels on the 65 GTO. They come with 5" backspacing. The largest tire I have so far is a 275/40/17. Regardless of what you wind up with, I want to suggest that you try Toyo Proxes TQ drag radials especially if you don't want to have to park when it rains. Unlike the Nitto 555R drag radials that are death traps on a wet road, the Toyo Proxes TQ drag radials are far safer in the rain, and do a good job with traction.
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