There's been a couple rego'd from up there (QLD), a very nice Rs2000/Duratec from memory.
The main thing i find is you need it to pass EPA readings due to the date of the engine. ie. its a lot newer than an old carby escort engine. So to do this you'll need injection. And whatever ecu you use to be tuned accordingly. This will mean dyno/tuning time.
Down here in NSW you can get an EPA test for free, other states i believe aren't so lucky.
Best talk to a couple others which have done it before, what they did, who they used etc. Theres a couple in the projects section from memory.
In Queensland, and without plugging anyone in particular.. Race-products have some parts for Duratec/Escort conversions and have a good knowledge. Worth a ring to find out more.
http://www.raceproducts.net/contact/