Hey Jim,
I've been following your stuff on the Taurus thread (my favorite airplane), and noticed your comments on old engines. What you need to run them on is a mix of 30% SAE 70 oil or the closest to it you can find, speed shops are a good source, and the rest white gas. White gas is not the same as today's unleaded, but unleaded will work. The closest thing to the white gas from the old days in Coleman fuel that you can get from sporting goods places an also Walmart, I believe. They are not too usful from the point of view of the throttle, but they are a fun diversion at times.
Fly Fast and Low,
Spud8939