You don't have to change anything. The E3 plug is designed to work with low voltage ignition systems
The 3 electrodes on the E3 plug make for a high millage and long lasting plus.
The spark is always dancing around to a different electrode causing less S/P wear and always having a good spark arc.
I never tried one but they should be OK.
A high performance CDI and magneto will probably give you 20% more voltage for a better spark. Regardless of what plug you use.