I do have a 94mm stroke crank for this build, so that's covered. But, the easiest way to get 200hp from a build of this kind would be to destroke the engine, say 80mm or less, increase the rod length and shoot for a high RPM. Torque would fall off, mid and upper range power would increase, and the engine would have a narrower powerband. Dual side draft carbs or ITB with EFI would be necessary. Could probably get a lot more than 200hp if this direction were taken. Imagine a 22R with a 96mm bore and a 75mm stroke spinning to 10,000RPM. Wouldn't have any useable power below 5000RPM. Not really something you'd want in a crawler.
That's not what I'm looking for here.