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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 have no clue on what proper springs rates work best for what shocks, but I would suggest emailing MaximumMotorsports and ask them. They are the only people I know that have a autocross stang.
They should be glad to let you know. They are VERY helpful as far as giving you information (if they think you are buying their stuff LOL)