I converted mine almost 20 years ago using the axle housing from an '81, and just had to change the axles, proportioning valve, and vacuum booster, along with the rotors, calipers, pads, and e-brake cable. It was fairly straight forward, although I may have had to get longer studs for the rotors. That conversion very noticeable improved my braking, so naysayers I dispute; in fact, I haven't had to do anything to my brakes since! I guess my advice would be to not try any cobbled together aftermarket set up without being 100% sure everything will come together correctly...
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78 White T/A, Carmine interior, Fisher T-tops, WS-6 package, 3.08 gears, a/c, rear discs. Original 403 with 300,000 miles replaced by new Pontiac 455 (roller everything, 6x-4 heads, Performer manifold, Hooker Headers, Hughes converter, Cliff's Q-jet) - I only get 12 mpg!
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