I would assume that the Electronin Feedback Valve is the same as what is commenly called a stepper motor. Jeep used the BBD with and with out this motor and 83 was the change over year so it would make sence that both are listed. The stepper motor bolts to the back of the carb, and has two wires conected two it. Sorry I can't seem to find any pictures of this.
bandhmo
bandhmo