Depends on gear ratio, rpm, hull, prop design, and desired use.
In my 3.0 powered boat, i had a 19p for cruising and heading to a fishing hole, a 17p for when loaded with people and a 15P for water sports (skiing)
You should have a 1:98 and your WOT would be 4600. So load your boat the way you use it most and do the things you want to d0. Then see if youor rpm gets close to 4600