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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
i was able to stuff 255 on my 7 inch rim. i would say on a 8 inch rim you would have no trouble putting on a 275. as far as side wall 60 to 65. i think with the stock 16 inch rims run a 60 side wall. so for your 15 incher mabe a bit bigger.