I have moved the question to the Engine section - sorry for balls up ;-)

-> moved to here

[Edited on 25/3/14 by kingster996]

If it were me, I'd use the pinto for Iva. The emissions will be much easier to pass. Get the Iva out of the way save up and swap out for a duratec (rather than zetec as the exhaust exits same side to save on bodywork mods)

You can get a pre aug 95 zetec that will not require a cat but are becoming rarer to find.

Once the car is registered with the pinto your emissions limits will be set, so when you swap to a zetec or duratec then you still won't need a cat for Mot.