Disc Brake donor vs Disc Brake kit....

I used a disk kit from Master brakes for the 66 Barracuda.it came with power boster ,11"rotors, new upper a arms ,new ball joints, bearing,hard lines every thing that I needed .The only thing I bought was a new reserve valve to hold presser on the rear brakes. the kit cost around $1200. made a great inprovement nicoles Dad Don
also it has the big bolt patern