zetec will pysically drop straight in n the parts will cost around £1000, thats if you want to run it on webbers or bike carbs, ive heard of people runnin the standard ignition but dave college, AKA, the master of zetec conversions, told me its a good idea to get crank trigger ingnition off a mk3 fiesta, should see a healthy 120bhp out of the silver top on bike carbs or twin 40's. but if you've got the cash then 200bhp is relatively easy. or stay old skool and tune the xflow, push rod performance all the way for me,