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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.
If you have an unused port, you'll find out quick cuz you'll leak coolant through it. Some kits require you to weld in the bung preferably in the t-stat housing, I opted for the kit that used a radiator probe.
I made one that goes in the radiator hose and uses the alternator/tensioner bracket as a ground. It works really good. (Excuse me but, I never painted it because it was not used very long.)