Hmmm, on an average weekend how modified are the competitor bikes? What sort of hp figures would you see out of the 1000s, how common are aftermarket wheels/calipers etc etc?
You have to read the rulebook.
http://www.soaracing.ca/html/2012_rulebook.htm
Although the theoretical possibility exists of using aftermarket wheels in certain classes, it isn't common. For one thing, they're really expensive. Never race what you can't afford to abandon in a ditch. For another, for riders who are also participating on the same machine in other series (e.g. nationals), there are restrictions on types of wheels used in those series. Also, although 16.5" wheels are allowed (see World Superbike) ... no one uses them, because the race tire distributors haven't made tires readily available for them, probably because the nationals don't allow them (unless the bike manufacturers start using them as original equipment - not in the cards) and there's not enough money in regionals to warrant using them.
Realistically, most bikes used in this class are prepped roughly as if they were "Supersport". Suspension (rear shock and fork internals only), bodywork, sprockets, exhaust, remove all the street stuff, maybe a power commander etc., and call it good enough. Not enough money flowing around to justify going to extremes. And you are riding at Cayuga (TMP) and Grand Bend. Big horsepower isn't a big advantage.
Even my vintage old FZR400 that I use in this series is basically a stock bike with suspension, bodywork, sprockets, exhaust, street stuff removed, and carbs rejetted. Engine is all OEM Yamaha parts - because it's more reliable that way.