Get yourself the Steeda G-Trak suspension. The kit comes with pretty much everything you'll need. Good wheels and tires are a big help, too. For cornering, get tires that are 1/2" to 1" wider than wheel for a good straight sidewall. I got 245/45R17s for 17x9 rims and they grip will well.
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351W 89 Mustang GT Convertible