hi mike
prop will be ok for the boat,depending on what you do to it will depend on what prop you change to.for now just run it as it is,the engine isnt up to much but practice with it then you can always go down the tuned route,a good tuned pipe will make a bit of difference,make sure rudder servo is up to the job,and most of all please please put flotation in the boat,swimming noodles are the best thing to use,DO NOT use expanding foam as it holds water
make sure you run it on a good 2 stroke oil,run it at about 20/1,once you have run it for abit running it in,you can lean the carb out abit for abit more power,but thats something to do later on
im sure you will enjoy the boat,i have a few boats i race and love every minute of it,
should you ever need any advice just ask mike,
all the best kurt black magic racing