I upgraded my 86 front end with a complete front end out of a FHP car. larger rotors and calipers and they are drilled for venting and cooling. I replaced all bushings with polyurethane and the sway bar and end links are new as well.
The back I am upgrading to disc brakes, I bought a Wilwood conversion kit that has all the parts and I can use my existing axles. watch what you get into with buying the swap parts off of other stangs for the rear because you will have a difference in axle width. I did not want to get into that because of the way it looks and clearance problems with certain tire combinations. I topped it off with a set of 17x9 4 lug silver cobra R replicas with sumotomo tires. looks great, rides great and not a bunch of cash spent. did not go with 5 lug conversion, happy with the 4 lug.