I'm sure it'll fit, i've seen mk1/2/3 fiesta/ford ka's with this engine arrangement in them.
Why don't you get a cheap mondeo ecu/throttle housing from a local scrappy.
Info here, its probably on this site but the search doesn't like me for some reason ;-(

A full guide to fitting a zetec in a fezza, very similar to a mk4 i would think. I'm sure some one will kick my teeth in if i'm wrong though
http://www.ford-force.com/forums/ind...showtopic=6381


Find the parts to upgrade to 130 spec

http://www.ford-force.com/forums/ind...showtopic=2527