Propeller Sizing Question - Help!

[PHN]

Thank you again, and I guess I am kind of stuck because when the previous owner changed the engine he removed or lost name plates, so I have little to go by other than what I have been told the engine and transmission are, and tach is in-op... ...

So I guess I am going to have to pay a marine mech to come down and identify/verify what I actually have etc.....

If anyone has anything comparable to the morgan with a 30hp yanmar with 2:1 ratio transmission...what prop are you running...just for info purposes...I realise I need to do more exact research to verify exact correct prop...

thanks....