depends on what type boat it is. more info, picture of the boat.
It should get it up on plane, but obviously it will be underpowered especially after you load her up. You might have to reprop her for the situation.
Loaded, I'm in that weight range with my 14' McKee which has a 35 Merc on the back (see avatar). She moves quite well.
I'm running a 15P on mine.
Of course, you need to measure rpm to get an accurate idea.
I'd try it out before doing anything.