Most of those "big brake kits" like the M-2300-K require 17in wheels, but those will give you the most stopping power by far. Thats probably not what you want, its more of a thing for road racing. On brakes, the best thing to do would probably be a rear disc conversion and/or better rotors up front (eg, drilled/dimpled) and better pads (metallic instead of the stock semi-metallic).
http://www.fordmuscle.com/archives/2...ors/index.shtm
Check that out. I think thats one of the best upgrades for the money in braking. Also, on brake pads:
http://www.fordmuscle.com/archives/2...ds/index.shtml
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