Nomad Willy
Guru
I’ve got a Paragon HF7B-L gearbox with a 2.03:1 ratio and a one piece drive shaft
2-1 is good for the prop clearance.
May not be best for thrust for a heavy boat though.
I wonder what ratio other boats most similar to yours have?
But of course one can use a suitable prop blade area wise and use # of blades and the blade area to load properly.
A gear ratio of 2.5-1 may have been less ideal.