Well the performer manifold gives out around 6000 rpm's if I'm not mistaken. Going with the performer cam sounds like the best bet. If you start bumping up the cam too much you have to bring the rest of the engine along with it. Raise the comp ratio, higher valve springs, stronger rod/head/main bolts....bla,bla,bla. The package cam should give you the extra ponies your looking for, without taxing the rest of the system. Good luck
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