I can get M body spindles, core calipers & slider brackets, backing plates, with the old lower Ball joints attached. Question is who has done this swap on a 71 a body with 10" brakes?? Do I need the later 73-76 A body upper control arms ? Do I need the later a body spindle lower ball joint? I want to put 15" rims up front so I can just order 11.75" rotors correct? What hoses do I need to order? Guessing I need a adjustable proportioning valve to work with the stock drum unit. Sorry for all the questions just tring to get it straight to see if it's a good way to go.