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