Which prop for 23 cc and 350 verado

[Kwaugh5p]

I am getting close like 2-3 weeks out to have my engine installed and rigged. I have no idea where to even start with a prop so am asking all the guru’s what they think. I believe the Mercury site said 15.5 and 17 pitch. Other people said like a 23 pitch. To many guesses. What y’all think. Thanks in advance Ken.