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I'd try the CC 268HE or the extreme Energy version around 270 duration. That should be good to 5000-5500 RPM power peak with a hydraulic flat tappet cam. You can call the CC tech line to get their recommendation for free. Ron has hit it on the head though as to the problem. You will also need the exhaust system matched for around 5000-5500. I use a 2 1/2" custom made pipes with 3 chamber Flowmasters out the back valance and that works well for me. The Performer is also matched for good low end and around 5000-5500 power peak.

Rev