ORIGINAL: ho2zoo
Another option would be to build two elevator servos into the aft end of the fuselage and drive each elevator half with a short 4/40 pushrod. The servos in the tail might even help to balance it with the 1.20 engine on the nose.
The midwest Stearman tends to come rather tail heavy without adding servos to the tail. Even with the 1.20 . I haven't decided what to use for elev push rods on the one I'm building now, but I do plan to use 2 servos on the elevator(mounted up front) and Pull-pull on the rudder.