Hi Rob,
My son, Aaron, won Intermediate Classic a few years ago at Brodak's using a Magnum 36 XLIIs. We have used it in a few planes, all with a tongue muffler. It does everything Phil G says it does, and more. It is a strict wet 2 engine for the style run you are saying and does it VERY well. WE used a repitched 10 1/2" 3 blade for ground clearance, and 11-4 when it clears ok. Have not tried the APC 10 1/2-4 1/2, yet.
The Kismet, unless grossly overweight, will be outstanding with the Magnum. Remember, Phil was flying the Diva (A full size PAMPA stunter) on this engine, and while is was piped, the pipe is being used as a regulator, or governor if you will. The only other engine *I* would use in that plane is an Aero Tiger .36. While a lot of people like the LA engines, I have them, and they do not compare to the Magnum or Aero Tiger, IMHO, for *quality* of run. I do use the LA 46 on planes like the TEOSAWKI, Cardinal Profile, etc..
Bill <><