Some rotors. two homemade brackets and a easily available not too expensive pair of caliphers. Make cardboard patterns , cut them again in 3/16 steel and bolt it together. It is a whole lot easier that one would think at first look. Have done two now.
Chester's book on how to build a T bucket says all you need also is a 1/4" spacer between the hub and the bracket.
There's a few different ways to do it depending on your abilities and how much you want to spend. D&D Brakes offers a complete bolt on kit using Jeep rotors. I have done them by using early AMC brackets and calipers with late model Mustang or RX-7 rotors mounted on the original hubs. Minor machine work is required. You can also machine the spindles to fit early Mustang hubs/rotors. Photos are of three different AMC brackets and two different setups using AMC brakes. Here's a link to more detailed photos. http://s225.photobucket.com/albums/dd187/fmc56/Econolines/disc brakes/ Plymouth Volare rotors will fit on the axle but you will have to make your own caliper brackets. They are a one peice rotor and hub. Dodge intrepid rotors will fit on the Econoline hub and again you will have to make your own brackets from flat steel. Fred