Chrysler went to electronic distributors in 71/72, so any factory distributor from that point forward will be electronic. If you prefer to stay with what your 1966 car had, ask for a 66-71 440 with points ignition. The cap and wires are the same as far as I know.
You COULD convert the 66 to electronic ignition using a kit from a variety of sources.
The 77 440 had a clutch driven fan for increased cooling ability and less power loss. It is a better unit that your 1966 fixed blade fan, but if originality is your goal, either will work. You really should use a fan shroud and make sure that all factory air seals are in place to ensure that there are no escape paths for oncoming air. You want frontal air to pass through the radiator, not around it.
