I built a all aluminum roots blowned(10:71 BDS blower ) KB street Hemi block(thier dry sleeves ) 499 C.I. (4.375x4.375)with a set of Dart cast aluminum water cooled heads, it had a EFI on a bug catcher hat, it made a little over 1100 HP on race gas with 17 lbs of boost . I built another smaller ,484 C.I., 4.250 bore x 4.375 stroke)C.I. blown street hemi motor with a new cast iron block with a set of Stage V ported, not big ports, aluminum heads and a 10:71 Littlefield blower with a pair of Carb. Shop Dominator blower carbs, it made 925 HP on CA pump gas at 7 lbs of boost and 1025 HP on 110 octane race gas with 12 lbs of boost I would buy another set of the Stage V heads and a KB Street Hemi block if you insist on using a a aluminum block for your build BTW, I like cast iron or Compact Graphite Iron blocks for my N/A builds