HAD SIMULAR PROBLEM RECENTLY CHANGED EVERYTHING WHEN GOING FROM POINTS TO ELEC YOU DONT NEED BALLAST RESISTOR ANYMORE
JUST USE THE MAIN POWER WIRE FROM HARNESS STRAIGHT TO POSATIVE ON COIL ALSO SHOULD BE ELECTRONIC IGNITION COIL NOT POINTS COIL AS THEY NEED HIGHER SPARK
MAKE SURE DIZZY IS EARTHED I RAN LEAD FROM DIZZY TO BODY

TRY TAKING DIZZY OUT AND ROTATING BY HAND WITH IGN ON SEE IF YOU GET SPARK THEN
THATS WHAT I HAD TO DO AND ITS ALL GOOD NOW