1966 Disc Brake Conversion Questions

As mentioned, the Scarebird approach is easiest and probably cheapest. If you go with the 73+ swap, you will also need to change your rear-end to 5x4.5 ($$$), or carry 2 spare tires. For more money, you can purchase everything from Scarebird, but cheaper to source at your local store or JY. Other kits start ~$700 (Wilwood, SSBC, ...). Some require 15" wheels. Many people run front disks with a manual MC ~7/8"D. For cheap power brakes, lookup my post using a booster/MC from a 98 Breeze.