What are the specs on your cam again? I don't know anything about the LS1 but upping the rocker ratio will give you more lift and a faster opening/closing rate. It could make more power if the heads flow enough to use it but it may also hurt power and RPM potential if the spring rate can't handle it. I've only looked your car over once and I can tell you that your biggest issue right now is your tiny exhaust. You need to address that first.
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