IF the engine was truly built at a Corvair College AND it has been operated AND stored appropriately, that is quite a find and the stars are aligned for you.
Unfortunately, William Wynne's reputation is known to scammers. There are occasionally engines on Barnstormers or Ebay claiming to be build by WW or by using his methods that are not. So familiarize yourself with William's methods (buy his conversion handbook?) and look the engine over. You might see things right away that tell you things aren't kosher. Or it might look OK, in which case you can contact William and he will work with you. He is primarily concerned about safety. A secondary consideration is the reputation of Corvair engines in general.
The CH650 / WW Corvair combinion is a nice little plane. Won't be a speed demon, but it is safe, fun to fly, and economical.
Keep us posted on the build!