Years ago we swapped my brother's Atomic 2 for a Volvo diesel - propshaft speed was 1/2 so a very different prop was required. I'd expect the same in your case.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)