That Stearman is a beautiful airplane. A few guys at our field have them and I keep telling myself I need to get one. there is just something about a classic bipe. I've seen the plane fly with a 1.20 and it is great. From what I understand though, it needs quite a bit of lead in the nose to balance so a lot of guys are using small gassers since the extra weight of the engine makes it easier to balance the plane.