It looks a lot like the Pacesetter 200 I have on my Mustang II (which has an O-320). Mine is a 68-66-20. They are out of business, used to be in Hillsboro, OR. Last time I called he was working in construction something-or-other.
Dan, what's wrong with your Sensenich? How much do you want for your prop?
ps. You should trade me your RV4 and then you wouldn't have to worry about it!
http://www.shaka.com/~lostsurf/airstrip/ Or if someone wants to buy my property I will buy Dan's 4!