I have tried several different springs. The Motorsport ones seem to be a good buy. FYI, stock ratings are 450-530front. Eibach was my personal favorite at 450-580. These are 10% stiffer and variable rate. Lowered the car jsut right with a wee bit more handling. BBK makes the 650# specifics. These are MUCH fimer, but are cheap too.
Control arms in themselves wotn get you much, unless they have poly bushings or revised geometry like the Juniors or SSM...
Recommend getting the "C" springs (taht you like), and poly bushings for the stock LOWER ONLY control arms (too much bind doing uppers -and- lowers).
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Darius Rudis
Home built t-arm/panhard suspension powered by an S-trimmed motor :-)
My Mustang Page