First, how much compression do you want to run? Is this going to be a pump gas regular, premium, or an E85 engine. Are the block and pistons stock or has the engine been gone through recently? Unless you're just after aesthetics, might want to reconsider the dual fours, twice the expense and twice the upkeep! If this is a street engine, a quality dual plane intake with a 600 to 650 CFM vacuum secondary carb will work quite well.