Help newbieDisk brake conversion directions

Hi, new to forum and got my first a-body. My brother had this car for 10 years and I've always wanted it so I finally got it. its a 65 valiant/barracuda convertible clone. I have a couple of questions to swap out the drum to disk brake conversion. he kept the car pretty original so non-power drum brakes up front. he was in the process of acquiring the parts to do the swap due to him not having the leg strength to push the non-powered brakes. Anyway, I have the spindles, backing plates and caliper brackets I want to retain the 14" wheels he has on it. He also acquired two power boosters. I'm not sure what size rotors or caliper types I need and the master cylinder setup that would fit. it has the 273 commando in it. I have also read that the bottom control arm needs to be replaced to accommodate the new spindles? any help or direction on this would be much appreciated