Ed,
Rick is correct about reading the plugs with the new gas but I run NASCAR Racing gas in both of my Cobras. I looked at the big block plug box and it just said Autolite NASCAR 45 plugs, copper core. They aren't expensive at all and are a lot cheaper than the platinum ones are. Using an analizer as Rick said is the easiest way to tune the car if you are running regular pump gas. Unless you have access to a dyno which we don't have around this area.
Ron
