Justcuz, it sounds like you are getting sick of drums AND manual steering. When I swapped out the drums for manual disc on the 66 in my avatar, I was able to get ALL of the parts needed to do the swap from one donor car. That means the spindles, rotors, calipers, and the distribution block. I lucked out by the calipers being already almost new, though I didn't know it at the time of removal. The items I had to buy were the pads, the master cylinder, the disc brake lines and rubber hoses, and even the front to rear brake line as that is also different from drum to disc. All told, I have probably close to $700.00 in the parts alone, and I traded for the parts on the donor car. I also did all the work myself, so it is easily a $1000.00 job to buy everything and have it installed.
By the way, I saw a post very recently where a member here had a complete Kelsey-Hayes front disc setup removed from his car to change to the later style discs with BBP, and he was offering the entire KH setup for $300.00, a steal for the parts included. I also saw another member with the same post offering his for $450.00, both were very good deals in my opinion as the parts were all useable as is. Thats the kind of score I would keep an eye out for if you really intend to do this swap, you'll be way ahead if you can find a complete setup such as these. Good luck with your project, Geof
By the way, I have a 74 Duster for sale with a 318 auto, manual disc brakes, 8 1/4" rear, bucket seats with console, dual painted racing mirrors, rallye rims and BF Goodrich tires, a lot of the good stuff already in place. It runs and drives, but needs a couple things done before it hits the road again. $2500.00 or best if you are interested. P.M. me if you'd like any info or pictures, Geof