Honestly, unless you are a speed demon. 300hp is plenty for a cruiser. My cruiser has roughly that and has no problem getting up on the road. Why are you needing 350hp? What is special about that number? Build the motor to enjoy not for speed. Ask Earlybird he has a 326 in his lemans. Sure he would like more power but he has bragged how a good intake, 4 barrel, duals, long branches will help bring any stock motor to life.