RE: Biplane kit needed.
Here's the link. It didn't meet reserve so the guy may work with you on the price. [link]http://cgi.ebay.com/BALSA-USA-1-3-SCALE-STEARMAN-PT-17-KIT_W0QQitemZ330217598548QQihZ014QQcategoryZ2563QQ ssPageNameZWDVWQQrdZ1QQcmdZViewItem[/link]
The BUSA Stearman is a very large airplane requiring a 4.2ci gas engine or larger! There are not very many aerobatic bipe kits left, much less designed specifically for a 1.40 4-stroke. The Lanier Pitts was recently discontinued. The Balsa USA EAA bipe is still available in a kit (for now) and would be a good match for your engine. You want to stay in the 8-9 pound range with about 60-65" wingspan to keep it fun. Good luck.
P.S. If your set on a Stearman the Midwest kit looks like the only option.