66 Front disc brake conversion, Did a search and couldn't find an answer

yes you can get the stock four piston caliper brake kit from a variety of sources. the two best imo are opentracker racing products and chockostang classic mustang.

http://opentrackerracing.com/

http://www.chockostangclassicmustang.com/

so check them both out, and pick the one you like, you cant go wrong with either one.

RetArmyWarrant, if the car was originally a six, change all the front suspension to the V8 stuff. Yours may be a cobbled-together home brew system that explains the extreme angle rod ends. The V8 had bigger steering parts and brakes. Some say the springs are the same and that could be possible, but other parts are bigger. My sources say rear leafs were 85 lbs six and 115 lbs V8. The six was 2600 lbs (I have a six), and the V8 shows 2900 lbs (I have had several V8's). Until I started modifying the six suspension I was not aware of the difference. Remember, the Pony started with Falcon parts...which were six only for years. Ford wanted to save money so they used the underpinnings of the Falcon for the Pony. Then they had to install a V8 because the HP wars were on. That caused the installation of bigger, stronger V8 suspension...just in case someone wanted to go racing. Hello Carroll Shelby! Good luck Warrant...my brother retired as Master Chief but made W2 while in Vietnam. Bro-in-law retired as Command Sgt. Major out of Ft. Hood. Me, 3 carriers, no awards, lots of memories and an Honorable exit.

the upper and lower control arms are the same six or eight. the tie rod ends though are different, the six being a bit smaller than the eight cylinder ones. the springs are the same, but different rates six to eight. so the only things you really need to change out are the spindles and tie rod ends, assuming the control arms are in good shape.

and i will also thank you both for your service to this country. my family also served, an aunt and two uncles, and one cousin as well as both grand fathers were all navy, and one grandfather was also merchant marine as well. by the time world war two rolled around though he was working on the railroad as a conductor, and was upset that the navy would not take him to serve in world war two since he was in a protected occupation. i also had two uncles that served in the air force, in the intelligence branch, one went into the CIA and kept the air force intelligence as his NOC.