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That is a lot of boost----I would never attempt to choose parts without the aid of an engine bulider-or attempt to build this motor at home--
Cam -heads- compression should be all chosen as a part of a comprehensive package
Spark plugs ?? strange question--after asking such serious mechanical ones-- but anyway aN NGK TR6 comes to mind as a popular s/c application
Unless I have built a single digit LS/FI drag car or graduated from SAM in Houston, TX or have an extensive background in LS engine assembly.............I wouldn't answer a question like that