I got a reply from M&H:
Quote:


The blue wire with the rubber mold on female bullet terminal states that it is for the distributor solenoid. I believe it is actually referencing an idle stop solenoid located on the carburetor. This circuit is tied into the keyed ignition. Cars with the A and E bodies also used an idle stop solenoid when equipped with the 440 v8. However the wire to attach to the solenoid was not included with the engine harness. Chrysler made an extension harness to be used.




So I guess I'll just pull that wire out of the harness since my car is not equipped with the idle stop solenoid anymore.