‘63 Dart heater control cables

I’ve been considering moving the heater controls from below the dash up to that blank area above the radio like the ‘64 Darts. Has anyone done this? It appears that the cables will be too short for this move. Any advice or suggestions. It wouldn’t normally matter, but I am thinking about custom air conditioning mounted below the dash and would like to attach it as high as possible. Thanks for any ideas.
Jerry in Denver