Upper and Lower Ball Joints

i'm going to piggy back onto this thread as it's something i've been wondering about as well.

i have a 70 dart swinger and plan on doing a front end rebuild. the car has single caliper piston disc breaks, which i'm pretty sure are not original to the car (70's were either drum or 4 piston disc, correct?) i checked my fender tag and it says nothing about brakes so it probably had drums and was converted to disc. i have no idea what the current brakes might have come off though. i'm trying to get it all sorted out so i can have all the right parts on hand and get the job done quickly. since it's my daily driver, i can't have the down time of running around or waiting for the right parts if i end up with the wrong ones.

what should i be looking for to figure this all out? am i even asking the right questions? lol

i'm green but more than eager to learn so any advice/tips is more than appreciated. :)