The 6C (c for chrysler) was the old msd box that had the mopar ecu connector on it. The only wiring required was the big power and ground wire to battery and jumping out the ballast.
Im getting ready to install one in one of my darts tomorrow.
Call Summit Racing, the MSD connector should be available and not expensive. I do seem to recall the 6al coming with a connector but I may be wrong.
I think I have bought the oem connector in the help section before. Its been a while so not sure if its something you can find now.
Last time I needed one I stole it off an old lean burn distributor.