I think the 1.8 engine is the same dia bore as a normal CVH Turbo engine so you can use any Escort/Fiesta RS Turbo parts.
I have a problem with mine that the CVH water pump is not man enough to push the water around the engine at low revs.
The higher the engine is revved the better the colling, but below 1500rpm the water movement was very small.
I have just put a post up asking if anyone knows if you can get uprated water pumps but noone has replies
Perhaps an electric water pump?