the right prop

[pathfinderz1]

I'm nowhere near ever starting the motor yet but was wonding what would be the best prop for my F Model 55. It will be going on a G3 for a friend and would like to get as much speed out it as I can. As far as I can tell its a stock prop on it now.
Thanks
Mike aka pathfinderz1
PS
Notice the home made jack plate the motor is hanging on. I can adjust it up and down as much as 6 ins

[pathfinderz1]

The boat waights 390 plus 2 peolpe and 2 tanks of gas plus the motor. So that is still a light load all totaled.
Mike aka pathfinderz1

[pathfinderz1]

Ok got to prop off today and numbers are 0842 10-B So what prop do I have?
Mike aka pathfinderz1

[pathfinderz1]

Thank you a bunch Bill I most likely will be getting back to you with more questions. I will be letting my friend know on the prop and see what he wants to do.
Thanks again
Mike aka pathfinderz1