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Simon,
Different people have had good luck with different plugs, but the main concensus is stay away from the platinum ones. I run a Jacobs Pro Street ignition and I have used Champion, Autocraft, and Motorcraft. I have the best luck and the motor puts out more power with the Ford Motorcraft plugs. As for the supercharger, I can't give you any suggestions there. Some of the guy's running them whould be able to help you in that area. You might play with various heat ranges and plug gaps also. I wound up getting the best results with a gap of .049.
Ron
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