'70 Dart 4-wheel drums to '71 front disc to '73-up front discs?!

Hello, my original '70 Dart (225 6-cyl.) came with front drum brakes.

Soon after I bought it, I scoured the junk yard and upgraded to front disc brakes from a '71 Dart.

Now with the age of the internet, I was able to discover that '73-up (because of large bolt pattern and one-piece rotor/hub) is preferred.

Question is, with the current set-up I have ('71 front disc), what do I need to upgrade to '73-up front discs? I ALREADY HAVE POWER BOOSTER AND MASTER CYLINDER installed for '73-up. (see here: http://www.forabodiesonly.com/mopar/showthread.php?t=186852)

What else would I need besides rotors?
Control arms? Ball joints? How difficult would this be? Should I even bother? Honestly, the two-piece hub and rotor was a NIGHTMARE for me, I thought I would have to say good-bye to the Dart, luckily we figured it out and documented the procedure very well.

Thanks