I'm doing it right now. I got my parts form an 87 Mk7. You can use parts from:
1. 1984 thru 1986 Mustang SVO.
2. 1984 thru 1987 Lincoln Continental.
3. 1984 thru 1990 Lincoln Mk VII.
You need a dist. block from a non-ABS car (I stole mine from a continental).
I'm using a Conti/Mk7 MC for a Hydroboost car, since it's cast aluminum, and looks stock, but it's a high-capacity 4x disc cast aluminum clone of the favored SVO MC. Use the MC rod from your car.
You need the dust shields, the caliper bracket & calipers and the ends of the ebrake cables, rotors, 2 short flex lines that are on brackets, and big flex line form the rear to the car. I'm getting ready to do this swap meself. It takes a special set of adapters from Ultrastang
I'm going manual at first, but I might go power if I don't like it, and if I can fit the MC & a 90 mustang GT booster in it like you can a 67+.
If you have a 65-66, you could try this booster/MC combo to see if it fits, so I don't have to find out it doesn't the hard way.
Check out ultrastang.com more for info.
HTH
--Kyle