IDK . . . It will be whatever the re-power shop typically uses or thinks is best. I believe it will be 3-blade.I know you said 19p for props as a starting point... have a particular model in mind?
since it is not my money I agree these are what you wantI think you should put these on it .., https://www.sharrowmarine.com/buy-s...6e08cd7450cbbdddc64c6cf2e8891f6d48747c6d56d2c