I purchased a kitted set of Granada disc brakes from Jerry Chaote at West Coast Classic Mustang. He's been in Mustang and Fords a few times - his car is very cool! It was very expensive....I would find parts myself the next time.
One thing to know is, pedal travel is increased...so if you expect 'tight' response to the brakes, think again! They travel about halfway before braking occurs. And boy does it stop the car! It's not jerky, just different than most other cars.
Thanks,
Mike
'66 Springtime Yellow Coupe
289, slightly warmed over
driven daily