I may have the wrong handle but my recollection is that the Ford
engine used in
marine conversions is sourced from tractors or farm machinery or some such.
There are many companies that do
marine conversions or make
parts using this six cylinder Ford
diesel as a base.
One in
england is:-
http://www.lancingmarine.com/
While the
engine that they convert is the Ford 2725 it is quite possible that most of the
parts will fit.
A seach on the
internet or some questions to your local marine
mechanic should find other companies in this field.
The
water pumps most used are
Jabsco, and I think their parts are readily available.
Your local Ford tractor dealer should have most if not all of the non marine parts.
So you might have to do some scratching round.