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I have a 91 k1500 with a 5.7 350 crate motor and I'm looking for more power I seen other places that people say throttle body spacers and air intakes are useless wondering if anyone else had better lucky with them and also jet preformance chips. Also I was looking at a edelbrock preformance plus cam and lifter kit wondering if anyone else has it or something and about how much more power I'd get from it