1965-1972 Dart, Demon, Duster, Valiant, Scamp, and '65-'69 Barracuda are direct bolt-ons.
'73-'76 A bodies discs work also, but require use of the '73 and up upper control arm (among other tidbits) and will change your bolt pattern to 5x4.5".
'76 F/M/J body brakes will work also, with same caveats as '73 and up A body discs.
Go to the "Brakes for your Classic Mopar" section of the forum and do a search. Hundreds of threads on this.
Brakes for your Classic Mopar
professor is that the 76 only year for f m and j cars
what is the ssbc kit and where to get itusing the SSBC kit means you can keep your current stuff including the drum brake spindles