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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 don't think you'll see a bunch of guys running programmers on 5.0 cars. There are some, but not a big following. I make >600rwhp on a stock A9P with no programmer (albeit I am way rich). And at 308/326 your 24lb injectors should be able to handle that without any issues. Between these 2 choices, I'd definately buy the programmer (but I don't think it's required).