Jim Lee is the man. He is in the vendors corner.

I have a couple of those.  A great RC or scale engine, but maybe a bit heavy for stunt.   Maybe you could just find a throttle position that works and go with it.

  It works very well for stunt. We used with no modification and about a .281 venturi and an ST spraybar. We used 12-4 3-blades and 13-4 two-blades, typical 46VF props of the time. The only modification was to ream out the exhaust outlet to the largest diameter we could with a Fox reamer (probably 3/8") without removing the stinger entirely. Launch revs were in the 11,000 range.

     Brett