master cylinder and prop valve question

[shelby2]

hello, could someone please tell me what kind (year/make) of master cylinder i would need for a 4 wheel power disc brake setup. i have front discs from a 78 granada and rear brakes from a 78 versailles. i was thinking about using the master cylinder and proportioning valve from the 78 versailles, but when i went to the parts store it said the proportioning valve was for abs??? i was looking at master power brakes' website and saw that they have those parts, master cylinder is $120 and the valve is $110, which is more than what i want to pay. i would appreciate it if any of you could at least steer me in the right direction, i thank for your help in advance