Depending on the exhaust setup and tuning - the results will go all over the place .
What do you want the engine to do?
produce max power ?
That's it?
Then opt for a small short pipe and a smaller prop and a increased intake timing :different reeds on a reed setup or retimed intake port on a rotary.
The ZDZSuper 80 a rotary setup really works on a long pipe and a big prop- The results are very linear over the entire speed band (rpm)
However if I flew wide open throttle all the time -as some do -I would have shorted the pipe and reduced the prop load a bit and gone for max TOP END only.
OR if I was a race - - I would have recarved the intake opend th carb size as much as practical and let er shriek - The converted weed eater engines do this nicely using NO reeds or intake valving .
Once you get the flow going - at the best speed for th porting - Most of these engines were designed to run WOT and typically at 9-10 thou -hour after hour.
For my own use ' NWAS.
When I was deep into pattern engine setups -year back using glow engines I tried the various combs - which really are no different in results than seen on gasoline setups .
The 11" tuning on a .61 on a 11x7" prop produces wild speed at fullthrottle but really a pain to fly as controlled power was non exiztant .
So when you ask "most power?"
qualify the desired results .