Aftermarket brakes for a 70 Dart?
My vote is also for the Doctor Diff Stage 2 brake kit. I installed that setup on my '70 Duster over the summer and it was a breeze. Kit came with EVERYthing, all the hardware, clips, wheel bearings, seals, splash shields (with foam gaskets), fresh new calipers with nice black powdercoating, plated rotors that were also drilled and slotted. I also upgraded to the braided stainless flex brake lines for even more pedal feel (already manual front disc car). I debated whether to go with that kit or the Mustang Cobra (Stage 3) setup but I'm very happy with these. Sure they're heavy but you can't beat OE Mopar parts in terms of durability for street use and ease of finding replacement parts. It's all just late-70s B-body stuff.
The website format is great too, detailed instructions and options to make sure you select the right parts depending on what car you're working with.