Sam -
200++ horsepower is a baseline target to get a "regular" street bike (fairing and such) to 200. In a liner you'll have enough potential to go way over 2 bills if you bring that much HP to Wendover.
I don't have the rulebook in front of me right now -- but if memory serves correctly "square" edged tires are specifically prohibited on bikes running SCTA/USFRA rules. The rule was aimed at putting car-type tires -- whether street legal or maybe drag race tires -- on a bike.
You do have a rulebook or four in hand during your build, right? Whatever -- you should think about getting one poste haste. The '15 book will be available within a month or so, but in the meantime -- get a '14 rulebook and use it and the updates and changes that ware listed elsewhere on this website. You'll then be privy to all the pertinent rules for bikes this year.
Welcome to the Forum. Visit often -- and please post photos whenever possible. We all are interested in seeing what you're doing.