1965 Barracuda Disc Brake Kit

Gandy Dancer said
... Where can I locate the front disc kits?

Many, many posts about disk kits. Many are just the 1973+ factory disk spindles and brakes. See Scarebird, Wilwood, SSBC. For K-H, you will be searching for rare and now-expensive parts, unless you luck across a 1964-72 disk car in a junkyard.