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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 believe the gap should be .052-.056. Although, I think some 5.0s take .044. There should be a sticker near your windshield washer fluid cover, I believe, that will have all emissions related specs.