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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.
Platinum spark plugs can't really be gapped, they're delicate enough to the point that you break them if you try to gap them. Some people have success, but its generally not a good idea. They should be pre-gapped anyway.