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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.
the stock rims for 87-90 are 7" wide, and I think you can fit a 26x8" safely. I wouldn't go any higher than this cause you might break the bead on the tire when driving.