These are great old engines.
They start and run very well.
If it ran good as a saw then it will run well as a conversion engine.
Saw motors to me make the best conversions anyway.
I have a Echo CS-300 that is of simular design I'm putting on an 120 ultra stick.

As with any conversion it depends on what your going to put it on.

You need to find the weight on the engine then look for a plane that calls for an engine of simular weight.
WWI and WWII planes need a lot of weight up front. Those stacked radial engines were vry heavy.
That's why the short even stubby noses on the planes.

What is the engine weight? And what was the bar size of the saw?