I did this to a 68 Valiant.Removed the booster that was bad and went manual.The kit shown has everything but the hard lines that can be easily made.Or you can buy them already made.
Factory brake pads 1973 up are used for the slider type calipers.
Are the rotors for 4 1/2'' bolt pattern ?
Wheel back space using a 6'' wheel for the front and a rear wheel with a 7'' wide and a 4 1/4'' or 4 1/2'' backspace will maintain a good look as this kit will widen the front track about 1 1/2'' per side.
The photos below are of a 63 Valiant using the same set up.
Front wheels are 14''x6'' rear are 15'' x7'' factory steel wheels both 4 1/2'' bolt pattern.I swapped the stock 63 7 1/4'' rear for a 1974 Dart 7 1/4'' rear with the biger bolt pattern and 10'' rear brakes.