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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.
rtv around the coolant passages, both sides of the gasket. you should have some tabs on the head that will hold the gasket in place too, but the rtv will certainly help it from shifting when you put the lower on.