Don't know if anyone has already suggested this but Steve Henry is the man when it comes to the RX-1. He's been flying it for some time in his Just Aircraft Highlander. He can probably answer all your questions...
Wild West Aircraft
http://www.wildwestaircraft.com/
Good Luck! I'm looking at putting the new Yamaha Genesis 998 Turbo in a SuperSTOL. They're all related and really good engines.
Clark