"You won't have to worry about Magnacores or any cable made with resistance core conductors since the path of least resistance is no longer the entire length of the cables but at the spark plugs where they should be."
Joe,
Have you tried grabbing hold of your Magnacores (or any type of plug wire) while the engine is running? How about with a wet hand and standing barefoot in a puddle of water?
The path of least resistance in any wire is the path of least resistance; which means .... the easiest path to ground - not necessarily the spark plug. The spark plug gap increases the resistance to current flow (on purpose) in order to increase the voltage and create a spark. If there's a current leak in the wire insulation and your hand (and body) provides the nearest conduit to ground, guess where the current goes? Of course, new plug wires keep those electrons safely on their way to the spark plugs. But still, keep those body parts away from plug wires when the engine is running. Modern ignition systems can pack a wallop if you're not careful.
Sherwood