Late to the party here but, I have a Pertonix electronic ignition and use the Lucas side entry distributor cap (with the pointed screw terminals). I use Magnecor 8mm carbon core plug wires. I never had an issue in 20 yrs but, three years ago I inserted a ½” length of solid copper wire (gauge 14) axially into ends of the plug wires (inserting into side entry distributor cap and making a positive contact with the screw-in terminal).
At the time, I was chasing down an ignition problem - which had nothing to do with my plug wires. Ultimately turned out to be a broken low tension lead on the coil (wire broke right at the female spade connector due to years of vibration).
Bob
PS: these electronic ignitions also require resistor plugs. I am currently running Champion RL87YC (Champion #327)