The most cost effective stock type brake setup for a Mopar musclecar would be the 11.75 late model disc brakes up front with the big 11 x 2.5 drums in back. Now that Doctor Diff reproduces these parts it is also a fairly easy install. There were a few years where the 11 x 2.5 rear drum brakes were a little hard to find. Even the front 11.75 setup started to get hard to find but now Doctor Diff is reproducing the tall caliper adapter so that helps a bunch. The last B body project that I worked on went with big drums and big discs. It is a nice package that fits under 15 inch wheels.

On my Duster I went four wheel disc brakes using 13 inch rotors and 17 inch wheels. But that was more of a "statement" car. A budget build, or a more period correct build, would more likely want the big disc/big drum combo.