I have a 1965 f100 2wd. A previous owner swapped the axles for 1968 f250 with drum brakes. I want to convert the front to disc brakes. I have found a 1972 F250 donor with duel piston disc brakes for the front. I have the rotors and calipers already. I presume for the hoses and the master cylinder I should I should get these for the 72 model. Will I need a brake proportioning valve? any other thoughts would be appreciated.