Its faily straight forward on the 5 lug upgrade. The easy way is lincoln Mark VII rotors. You will need 87+ 5.0 calipers and spindles. Pre-87 cars had 10" discs, 87+ got 11". You could also upgrade to the Mark VII calipers, but a lot of ppl said it makes the pedal a little more spongy unless you upgrade the master cylinder. Thats the easier way. If you did this way, id get some nice pads and tires, that is going to make the largest different on your braking ability. Alot of ppl also sware on the stainless steel caliper bushings as well.
Next way is sn95 calipers, brackets, rotors hubs and spindles. If you get a 99+ you also get dual piston calipers instead of the single ones.