I think the 200 would be way overkill for the plane. You'll have to add some weight to the tail to get it to balance without a doubt, and you're fuel won't last long without adding a larger tank, which may not even fit.

There are other airframes that would work better for that engine.

I've heard of people putting a Saito 150 on the ST, and they reported that it was just too much, so the 200 would really be pushing it.