The stock crankshaft can easily handle our 107" kit. For reference we used a stock crank on our Procharged 09 bike that made 150Hp/130Tq with no issues, however that was a bit outside what I would consider its limitations.
There is sufficient material to bore to a 107. There are several other well know companied that have been doing this for years, we are in no way the first to go this route.