I'm going to suggest you start with 15 inch pitch props for your set up.
Try a pair out, and see what your maximum RPM is at WOT, then go from there.
17" will probably be too much, 13" too little , unless you load very heavily and operate at higher altitudes frequently, in which case the 13's may be better than 15's.
Most props come in 2-inch increments, unless you search quite a bit, in which you might find a set of 14's in 4-blade aluminum, if that's what's really indicated.
Good Luck!
Joe. :teeth :thup