Only 1963 1/2 Falcon Sprints came with a V8 (260).
Falcon's were not available with C4's (or 289's) until 1965.
302 introduced Spring 1968 in Passenger Cars, 1969 in F100's, Bronco's & Econolines.
Suspension, disc brake upgrade: 1975/80 Granada/Monarch was what ppl used to use.
And, btw...1976/80 Granada/Monarch were available with optional REAR disc brakes.
The same rear discs will also be found on 1977/80 Lincoln Versailles, which were really nothing more than a rebadged Granada.