1968 Dart A/C Conversion question

So my Ragtop 340/4spd. is all Black. Planning on moving to NC. in a couple more years. I was thinking maybe selling both Darts and moving on to something different or Adding A/C to my Ragtop. Curious what options are available and if someone who has been down this road can give any advice.

Dart Pic 2 (2).jpeg