mark, 400whp n/a out of any b series platform is gonna be a hellacious task.....you are gonna have to build a serious one off motor for that. vteckidd had an allmotor b series that was i believe the highest whp b series for a pretty good distance and it was ~240whp....its hard to make these motors go that high on just motor. you can slap a turbo on and have that power relatively easy, and much cheaper, though..jst a thought