Start with... A PLAN!
I would highly recomment the Mustang Performance Handbook-II. It has to do with suspesnions.
I would start with (in this order): subframes, springs, shocks, K-brace, strut
tower brace.
Pause, check your wallet, then continue with 8" wide wheels, and 245+ size tires (16" 4-lug are cheaper, than 17" 5-lug...).
Try this. By then you will be amazed at how much you got for so little investment.
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Darius Rudis
Home built t-arm/panhard suspension powered by an S-trimmed motor :-)
My Mustang Page