RE: OS. Mod
I ran a few of these engines in 80 mph limit combat with 9x6 props and they are perfect for this application.
If you can drill out the crank and do some timing mods, you might get 100 MPH [8x6 @ 18,000 rpm].
I don't know if this engine can be worked to ".32 CVA" specs, but that's what you would shoot for.