Hey Bob,
Do you want to work your magic on my -9? I wonder if I can run with the big boys AKA O-320 or bigger if I cleaned up the airframe.
The only problem is I'm stuck with a fixed pitched prop due to the O-290-D2. Well, that's not exactly true as the engine originally had a controllable (not fixed) pitch prop.
The question would be, as the airplane speeds up, I would need to upgrade the prop to match it.