Go on Brodix's website or look up M2 cnc'd heads (also sold by Brodix, but they do other mfg's stuff too.); some of the more radical non-production based stuff can flow 400cfm+.
VanB has a good point on the Busch LS based, but there are some oiling issues on the bottom end-- lots of lost motors at Louden this year from rods/cranks- a lot of people were blaming the spec required Wegner oil pan. They do make good HP in race form though, I believe that are talking 650ish with the 390cfm carb.
-Dan
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68 Camaro RS/SS, Katech tweaked LS7/t56 magnum
68 Camaro RS Convertible Project
2006 Corvette Z06
2011 Corvette grand sport convertible
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