Didn't say they were not, all I said is to make the 400 hp goal the OP wants it's practically the same recipe be it 318 or 340/360, if you feel the 360 makes more sense, I'm not disputing that, I would tend agree, (I got a 400 hp 360) but I disagree that the 318 needs a vastly different combo to reach the OP's hp goal.