I almost have your exact same set up. My guy assured and reassured me the 100 kit was absolutely nothing to worry about and there was no need for extra fuel pump, constant timing adjustments etc etc. The motor is not broken in so I havent used it.
That said, I'd say if you car is that consistent you have a hard to beat car
Not saying “your guy” is wrong but building in a margin of saftey is never a bad idea. Most people don’t use a fuel pump large enough to supppy just their engine, let alone an additional fuel supply for nitrous.
