Original Mopar 223 AM in '64 Dart GT

However, to answer my own question for the next guy... The connector from the Mopar 223 has a red and orange lead. From what I have been able to conclude so far:

Orange: Illumination. Connect to the Instrument Panel lead on the Fuse Box.
Red: Radio. Connect to the Radio lead on the Fuse box.

That's working for me so far... but admittedly it isn't perfect yet.