I have. Changed to 4.5 pattern axles. Used the Green bearing set up. Conversion tells you what rotor and caliper to buy at your local parts supplier. You'll need a adjustable portioning valve. Straight up instructions. Here's a pic of it.
What is this going on a 72 Dart? I was just gonna order them from Mark at Scarebird but he doesn't know if there are any issues with springs etc... He states he has never done one on an A Body.
Has anyone else done this conversion? I want to know of any issues before I order them.