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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.
The spring upgrade may not be necessary if you get a new set of heads as AFR has started installing stronger springs. I know the stud mount spring upgrade was $180 from AFR and the pedestal mount upgrade was $60, but if you buy them from AFR they should already have better springs, or so i've read.