Misfiring issue

Is this the first time with this combo? What type of plug wires are on the engine? Did you ohm the wires for resistance? Any/all wires must be under 20K ohms! What is the pick-up coil to reluctor air gap? I do not like the Mopar Ign. Eventually you will choose an after market system. MSD is good. You choose! Although I have two MSD 6 AL ignitions to return for "missing" problems. But they were in the "cars" for 5 to 7 years w/no problems, then all of a sudden, miss fire from 4500 up to 6000! How big is the fuel line? 3/8 minimum. Number 70 jets front and 80 jets in the rear are a bit small, especially for fall. Even w/power valve you should be in the mid to high 70's front and mid to high 80's rear. Does the carb have jet extensions in the rear? Go "sparky" Go!