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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.
It will depend on the condition of the heads.....have a machine shop clean, maganflux them first, and evaluate them for needed repairs. That usually costs ~$65-$100.......in my NOTW.