Finally my Denso Iridium plugs arrived today. They weren't cheap at $11.99 each from
www.sparkplugs.com, but I decided to give them a try.
I went with the ITV20, which is 2 heat ranges cooler than the stock Champion plug. If you want to stay at the factory heat range, the Denso plug is an ITV16.
This picture shows the Champion and the Denso side by side:
This picture shows the Champion electrode:
This picture shows the Denso electrode:
Note that the center electrode is extremely small, not much larger than a big needle.
I'm going to gap them at .040" and install them in the morning. I'll let you know how they perform.