Could use a little 66 dart schooling....

If you're not doing a resto then the world of custom is open to you .

You can make your own layout for gauges using aftermarket stuff.

The '63 darts used push pull cables for the heater mounted under the dash, you could mount them in the dash face .
Or you could go aftermarket heat & a/c
using their controls.

Pick up the dash pad offered above. The defrost vents are available aftermarket.

Weather strips and glass are also available aftermarket.

Front and rear bumpers, grill and headlights, hood and trim, front fenders are '66 only.
All of the above can be changed to '63-'66 with Dart , Valiant and Barracuda stuff for a complete front clip that bolts on.

You can use '65 Dart tail lights in place of the '66.

You also can use '63-'65 Dart rear bumper and brackets , but you will need to add the rear roll pan also.

BTW the whole instrument panel is bolt in once the w/s is out.
This opens up the using a complete I.P. from any of the '63-'66 Dart , Valiant or Barracuda.

So this may make finding parts more interesting but it sure would make a statement as a 'one piece at a time' second gen a body.