My brother has a '92 GT with unported GT40 heads, unported Edel Perfomer I intake, "e" cam, and a rebuilt Paxton s/c that makes 9lbs instead of 5lbs with the same pulley. He just dynoed at 375 RWHP/RWTRQ. If he improves the heads, cam, or intake I am sure he make 400. So it can definately be...