Here is a photographic guide to fitting a Zetec engine into a 2+2. Most 2+2s were sold with a engine subframe designed for a CVH engine. Where the Zetec has a 16v head and is slightly longer, a few minor modifications need to be made to the offside engine subframe. Some people have additionally needed to modify the lower front cross member to clear the exhaust, but wasn't required in this installation.
The gallery below concentrates on the modifications needed to the engine subframe. More details about the conversion can be found on Zetec engine into a Mk2 Fiesta. Here you can find more information about wiring the ECU and engine wiring loom into the Mk2 Fiesta. Additional information can be found on Jim Hearne's excellent website.
