Key stuck in ignition?

Folks, a '66 Dart doesn't have any kind of ignition key interlock with the shifter (any kind of shifter) or any other part. There is no release button to remove the key, either.

The '66 Dart in question has an ignition lock cylinder that has failed, plain and simple. The fix is a replacement ignition lock cylinder, that is this one. If you want the same key to operate the doors and ignition, take the new cylinder and one of the car's existing keys to a good locksmith. Once you have the new lock cylinder in hand, replace it:

1. Disconnect the battery negative cable.
2. Place the blade of a small flathead screwdriver in one of the slots of the ignition key bezel, and use a small hammer to carefully tap the screwdriver so it nudges the bezel counterclockwise. It shouldn't take much tapping before the bezel can be unscrewed without the hammer. Do so.
3. Maneuver the lock cylinder and ignition switch assembly forward so it exits the dashboard; drop it down below the dash to work with it.
4. Unplug the multi-wire connector (good opportunity to inspect and make sure the wires are in good shape)
5. Find the little brass lock pin visible through a small window in the shank of the ignition switch. Use a screwdriver to firmly press it while turning the ignition key to the "Start" position. Hold the key in that position and pull the lock cylinder out of the switch.
6. Install the new lock cylinder in the switch the same way (key held in "Start")
7. Reassembly is the reverse of disassembly.