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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.
That could be your stat being stuck open. What exactly are you getting done to the engine, what do's the overhaul entail. We might be able to save you some cash if it 's easy stuff.
All but the dyno can be easily done by an experienced car guy. Why the dyno? Are you just curious what numbers you are putting down? With stock heads i would not expect much.