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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.
The Explorers came with gt40s until halfway through '97, when they switched over to gt40p's. Both have their benefits and downsides, but either will be a nice improvement over stock E7 (assuming you have a 93, as per your name) heads
Edit: an Exploder intake will also be an improvement