Spark plugs and plug leads type ?

[Parkur]

Dear Friends,
Should I use resistor or non resistor spark plugs ?
And what would be the specs of the plug leads ?
Also, do I strictly have to use non adjustable ( dumb ) timing light while checking the ignition advance ?
Regards
Kerem

[brentp]

Resistor plugs, please. Regular plug wires should be fine.

[mleahey70]

Just so I know, what is the downside with using a non-resistor plugs?

[brentp]

Significant RF interference that can disrupt electronics. Not worth it.