74 Dart Stalls when in gear.

another thing- the aftermarket electronic ignition in my Scamp (it's one of those ones with everything contained on the distributor) needs 12.6 volts to power the spark. One of my brother's barracudas with that system will actually stall if he is at a red light with the headlights on because the voltage drops just enough.
Not sure if it's possible for something like that to be happening (if, when the idle drops, the voltage is dropping to a point where the MSD is unhappy...).