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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.
+1 for the horsepower difference, I have had both on the same car and the only difference is sound; the X is raspy down low, but sounds nice up top. The H sounds smooth all the way up...
Supposedly, the H can't merge gases as well above 3k rpms, but I don't know how true that really is. Main difference is sound. H is throaty, typical mustang sound. X is a little raspier, but can still sound good w/ the right catback.