Just dropping this info here I have American Racing Thorque Thrust 18 x10's on the rear of my 71' Dart with a stock A-body 8.75 rear end, but the car has to be mini tubbed with a spring relocation kit and the wheels need to be back spaced 6 1/2" and if you plan to run the exhaust out the rear...
A few photos for what it's worth in helping you solve your problems. I have the same 4 wheel disc brake kit on my Dart, but did not purchase brake lines from them. I made my own line from the proportioning valve to the rear of the car (I chose not to use their proportioning valve, bought a...