[NO SLO PK]

With the boost you intend to run, an MSD or equivalent spark box would be highly recommended. Without it, the spark will most likely get blown out...nothing really harmful except for an tremendous loss of power. If you're going to get an MSD anyway, the timing retard feature can't hurt. You could set your initial timing say around 14 degrees, and have the MSD pull it back to 9 or 10 under boost. Also, I've heard a lot of great things about the new iridium (sp) plugs. I'm trying them out next week...will let you know.