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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.
They'll get you a good "safe" tune. I would recommend finding somebody who can really tune your fuel injection and scrap the hypertech chip. Get it tuned on the dyno and you'll still have a reliable tune, but you'll make more power.
You could build 10 motors with the exact same parts and never get 2 that put out exactly similar dyno plots. Hypertech knows this so they'll program in a margin of error, on the safe side.