Restoration would require the one year only '69 B body disc brakes which are tough to find and aren't very good once you do find them. Best bet is to upgrade to the 1973 or newer large spindle knuckles and then you can bolt on 11 or 11.75 rotors from the '73+ cars. It is getting hard to find parts cars in the wrecking yards anymore but maybe there are some in your area. If not the knuckles aren't too hard to find for sale or you can buy repo parts. I'd be very careful about buying disc brake kits. Only good brake kit that I know of is from DrDiff. Most of the aftermarket stuff gives you crappy Ford parts or Chevy parts which don't really fit and then it is a mess when you try to buy replacement parts. For a daily driver the best solution is to just retrofit the factory stuff on there and then the owner just buys replacement parts for a '75 Duster or something like that.

I have a spare set of reproduction knuckles if you need them. Just shoot me a PM if you want them.