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The small diameter Ford 9" bearing disc brake kits fits the 8" Ford just fine, I am using the "Ford 9" High Performance Rear Disc Brake Conversion Kit. Mustang, Street Rod Item # 200706644870" from Pirate Jack's it cost me $360 when I bought it, (might have been off Ebay I can't remember) but its got drilled & slotted rotors and integrated parking brake, all this and it bolted right on my 8" rear end, just measure before you order as it might not say it fits the 8" and make sure the flange bolt pattern is the same. Best of Luck Matthyj
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Here's the link to the Pirate Jack's Disc Brake Conversion that Matthyj mentioned.