Can be a ton of things, first Mopar electronic?, also you need to see where the distributor curve is at they are all different. Almost sounds like a MP ignition kit was put in, really a fast curve for the strip really and the new ones have clone ECU's that are junk. Are the bushings in it OK...
Very hard to find 71 440-6 dual point. Completely refurbished, NOS Vacuum advance asking 1800 without a core. Any questions just ask. PN Mopar 3438577 Prestolite IBS 4019B 34th week of 1970 Tag is original not a repop. This is the real deal.
I found this buried in a box with other non mopar items.
Used, but Looks really good..asking $900.00
To late to pack and ship.
I will be at Carlise n 170 - 71.