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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.
You need the titanium Bosch +6 plugs with the iridium core and platinum variable electronically controlled gapper. They're a bit pricey but well worth it. As you go faster, the gap is electronically changed between the 6 tips to make sure the fuel is burned as efficiently as possible. In the end, that means more power to the wheels.