My ‘47 Fraser developed a skiplsurge at light throttle again. Checked my maintenance history and spark plugs had not been changed in 4 years. Replaced plugs, no change, in fact a bit worse as it feels to be running on 5 cylinders. Suspect plug wire as I had this problem previously from leaking wires. Can I upgrade to the ‘beehive’ style for later kaisers to combat the leak problem ? If not, where would a good source for plug wires?