Dave,
My first Crownline was a 1993 182BR w/ Carb 4.3 Alpha 1 set up in it. I do not know what the gear ratio was on the Alpha 1 but I tried several props and the best prop for hole shot and speed combined in one package was a 21 High Five Stainless. I think I paid about $500 for that prop back '94. See if your dealer will let you try one out. Good luck w/ your new boat!
Glenn
2007 23SS w/ 350 Mag MPI & Bravo III
Forward Facing WakeBoard Tower w/ Top
SS Docking Lights & CC Side Thru Exhaust
Lost the Decals, Applied Tint, Went Stealth!