Generally, stock honda blocks will take up to 50% overall hp boost safely, whether it's nitrous or turbo. You can set a fuel controller to open it up at any % throttle. ex: full boost at 30% throttle. Most nitrous systems work with the push button, but all can be controlled by throttle with the right controller.
You might start at a 50 shot, but you probably could run 60 if your motor is in good health.