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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.
I'd go with equal length shorties for now, 1-5/8" in diameter with a stock motor. you can always go with long tubes later if you decide you really want to modify the engine a lot but long tubes are a lot harder to install and make working on things like the starter much harder to do. ask OB if you don't believe me on this one, he will tell you all about how hard it is to get to the starter with his long tubes which he loves to brag all about. LOL