Seeing as how the Aurora was designed for .61 two-strokes, and the many Auroras I saw fly back in the day all flew with authority on them, anything bigger than a piped .61 is simply excess horsepower. That's not to say it wouldn't be more fun, just unnecessary for this plane, as it isn't meant to be a 3D/AA ship.

Remember that bigger engines: 1) weigh more = heavier airplane
2) cost more = less money for fuel
3) need more prop clearance = longer/heavier landing gear and no retracts
4) drink more fuel = less money for airplanes

...all of which tend to offset the advantage of having more power in the first place.

Do we really need an Aurora that can prop hang?

Rick