I was hoping someone might be able to help me determine a few good prop sizes to give a shot on a hull.

It is a 56" Deep V Apache, probably weights 15-20lbs (not sure exactly, will find out later today). It is a surface drive with a (from what i understand) modded Zenoah 23cc engine. It currently turns a Prather 275 (2.95" diameter, 4.300" pitch). I assume a step up or 2 and maybe a step or 2 down in pitch/diameter would be the best starting place, any suggestions besides that? how much of a step?

Running conditions would be fairly smooth water, but also driven behind a real boat for the purpose of something entertaining to do. Top end is fairly important, but I don't want to sacrafice a half decent hole shot.