want 400+ rwhp....iron or alum. heads?

hey guys....im looking to get around 400 or a bit over 400 rwhp...i dont want to stroke it so a supercharger is obvious.....what im debating on is should i go with iron or alum heads...i know i can make more hp with some tfs or afr's but will boost and some gt40 or gt40p's crack 400 rwhp easily? some boosted iron head dyno #'s would be appreciated:)
 
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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 done.