4 wheel power disc brakes in 73 duster

no i did not pick out rims yet. now i might have my hands on a 8 3/4 so i will put discs on that. i am just getting all of my eggs in one basket before i do anything. i only like doing things once. i will probably relocate springs on new axle if i get it. everything has to come out anyway. would like to get 18x10 in the back if possible. just need to figure out offset etc.. would also like to say thanks for all of the help guys!