Had one on my '69 Road Runner back in the day in 1969 and at that time it really seemed to work and improve performance. Don't know for sure but I think the Delta Mark Ten tech was the predecessor to the MSD (Multi Spark Discharge) ignition technology?? Anyway I found an NOS Delta Mark Ten "B" (B meaning you can deactivate it if desired) and wondering if it would work with a Mopar electronic ignition system? I think before I change the GTX's OE dual point system to the Mopar electronic system I'm going to "seat of the pants" see what happens and see if I can tell any difference as I did back in the day?