15x7s with the standard back spacing will be fine.
If you got to 275s on the rear, you could get away with 15x7 but should really go to 15x8s.
This is assuming its for a 69 GTO which I am guessing by your name.
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 "Yes, it's a real GTO. I know the scoops, spoiler, exhaust tips, and rear wheels are wrong. Umm, sure it's the 'big block' 400, you are quite the expert. I am driving in the rain, at night, running errands, with the kids who are eating and having ice cream in the back, after going to the drag strip, burning rubber, and blowing donuts. Do you really think it's numbers matching all original?"
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