I got a good deal on a used Cobra brake kit. Complete system, including 13" front rotors, rear disc brakes, master cylinder, SN95 spindles, axle shafts. Essentially what you would get with the Ford Racing M-2300-K kit, which currently goes for over $2000. I paid a bit more than I was expecting to spend to upgrade to 5-lug, but I'm very happy to upgrade to 4-wheel disc brakes, and the 13" front rotors should be good on the track.
The only problem right now is the brakes are in L.A. and I'm here in Utah.