1970 flatback prop suggestions

[Rogojax]

I have a 222 flatback with a 200 Yamaha hpdi I want to run a 4 blade prop was woundering what size prop would be best I was told a 14.50 x 19 pitch was perfect I would like some input if possible?

[Aswaff400]

should be a good start with that prop, im running a 14-5/8 x 21p revolution 4 with my 225 EFI which is working great on my boat

[Rogojax]

 Good deal thank you I will start with that and go from there