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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.
GT40Ps have smaller combustion chamber(higher compression), burn fuel more efficiently, and outflow the GT40 heads. The downside is the spark plug angle. You would have to put 90degree boots on a few plugs and maybe dimple the headers in one or two places.