the one in my fastback is a million year old junkyard distributor from a mid 70's dart that i put a custom curve on, with an old AF mopar orange box, standard motor parts ballast and delco coil (all of this stuff has been in there for 15 years)
the one in the 71 D300 (with a 383) is a junkyard unit from a motorhome that had a 400, recurved, with a standard motor products ballast, the same junkyard ECU and a accel chrome coil.
the parts are pretty universal, as long as they're not lean burn, they'll work.