Black top Zetec will not go through the IVA without a catalyst and to ensure that it works properly you'll need to keep the ECU wiring and injection system from the donor car so bike carbs/throttle bodies won't work. There are also issues with the Built in anti theft systems which can make using a black top a pain.
Go in search of a good pre '95 silver top - there are plenty cheap ones around now and that can be run on bike carbs/megajolt ign.
Simples
BV.