My suggestion is to consider IRIDIUM plugs. Reliable sources say iridiums produce significant gains in supercharged applications, even with a spark box like an MSD.
I'm getting a set this week. They're coming from X-M-P.com .
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Russ L
'91 LX - 331 w/ Procharger
'03 Cobra Convertible - Pullied
'94 Lightning
'65 Mustang Coupe
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