racedvl,
You have several options. Use a 9' Ford with disc out of a Continental or a Caddy. Unless you plan on making your own adapting plates for disc brakes, you're better off buying a kit for a 10 or 12 bolt. The best prices I've found for with Caddy parts or even Corvette brakes is here
http://www.ecihotrodbrakes.com/rear_...nversions.html
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Gerardo
1983 Custom Truck
TX Plates: "BAD BOW"
http://www.geocities.com/abetterchemist/