It's possible to use the disk brakes from a 1968-1970 full size Pontiac, but those parts weren't very common even when new and are hard to find these days. The Scarebird kit will work with the original 14" wheels, the Master Power kit requires 15" wheels.
https://scarebird.com/index.php?rout...product_id=251
https://www.mpbrakes.com/front-brake...1966-front.asp