KH brakes questions

Hello, My 66 val has 14' cragars and i have been told that i cant bold on just any front disc brake set up ? all my research is telling me to get the KH kit is this true ? or what kit do you recommend to buy ?
My 67 Barracuda came from the factory with 4 piston KH disc brakes.
I think Doctor Diff offers brake set contact him he a good Guy.