HELP! 11.75" Disc Conversion - Bearings, Seals Etc

I hope nobody minds if I piggy-back on this thread. I also want to go with this 11.75" rotor conversion on my 69 Barracuda which currently has its stock manual drums. I have bought upper control arms/spindles/caliper brackets (sliding pin type) from a 1974 Dodge Dart.

From what I understand, I will need to drill out my lower control arm ball joints to accept the larger later A-body size. So when ordering parts, I should order everything from a 1974 Dodge Dart, except for rotors and caliper brackets from a 1979 Cordoba?

I realize that I will also need a proportioning valve (from what car?), and disk brake master cylinder .

Thanks for the information. I live overseas and don't want to make a mistake with parts because I won't be able to return them and it will cost a fortune to ship them.