2ltr zetec bottom end does (with some small mods) fit straight on, theres good power & i do recommend it, though i'm now building a 16V turbo'd zetec engine to replace it! as said ian howell is the man, & if you follow the link you may find him
http://www.zetecturbo.com/ffmprofile.htm
why dont you just turbo the complete engine?
Lots of good info here to http://www.fiestaturbo.com/phpBB/viewtopic.php?t=77570
Edit again! ian http://www.area-six.co.uk/