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I have seen 360 WHp out of LS1 with different Cam, headers and stock tune. I don't know about 450 WHp on a stock tune, maybe out of an LS2. (Bear in mind that a Mass Airflow based N/A configuration will accommodate flow improvements very well).
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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