FWIW, (and that may not be much), I'd stay away from turbos too.... who needs the potential extra problems, why do you feel you need so much more power?
Shame the way things have gone, but there may be a less expensive way out than full out replacement. I suspect any real cost recovery would be a long shot.
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)