smarkfagen,
If you go to the Great Planes web site you will find a manual and reviews on the plane.
Here is a link http://www.greatplanes.com/index.html...do a search for Stearman...you will get all that info you need.
As far a engine I usually go by the manual and use what is recommended at the top end of the given range. To small or to large of an engine each have there problems. If you do a comparison between the engine you have and the recommended engines ...weight, RPM, torque, etc you should have a good idea if this plane fits your engine. Use the manual and you won't go wrong.
Shubova
[8D]