Hi Craig - Im am also looking down the Duratec parth for my Mk1 Capri.
As far as i have found out the 2.0l and 2.3l have the same block.
I'm not shure about the 2.5l.
Some parts are now made here in aus eg water rail, engine mounts, bell housings and dry sump kits.
have a read through this forum as alot of questions have been asked.
http://www.turbosport.co.uk/forum.php
Mark B