Welcome aboard and congrats on the new to you boat.
Are you happy with the current prop and does it achieve the proper WOT around 4600 - 4800 rpm?
If yes the drop by a pitch going to SS.
You can also try Mercruisers prop calculator for recommendations.
Note going to SS can cause greater damage to the drive if you strike an object as the SS will give less and the stress is transfers to the gears.
1997 2400 SCR
5.7 Vortec / Bravo 2