ric wrote:
You're better off getting rid of the points system for an electronic ignition for more reliability. Other then that? The answer to your "wants" are no. If your ignition system is working up to spec adding thicker wires and a hotter coil won't do a single thing except make your wallet lighter.
But they Look Pretty
The reasons for the better wires are noise, less resistance, and dualbility. You could get slight gain off of a better coil, but it take a little more energy to run them. So anything in mileage would be pretty much nill.
The better wires will have better boots on them and hence more waterproof as well.