Expanding a little more, now that I've thought about it.
Sure, the engine itself would bolt right up, but the transaxle is going to be your problem. There are a few guys on the Focus forum that have done it in their Focus, but they are able to just grab the SVT engine, transaxle, and ECU, and swap them in 1,2,3.
You would have to use your old 5-speed transaxle because of the difference in trans mounts between the Contique and the Focus - which is a bad idea. Having had an SVT Focus in my garage for the past 4 years or more, I can tell you for certain that unless you're running ridiculous amounts of boost, you DO NOT want to saddle that thing with a 5-speed transaxle; it doesn't have a broad enough torque curve to handle only 5 gears; it's really peaky and takes a lot of shifting to get anything out of it. With a 5-speed it would just bog every time you shift, and would probably be frustratingly un-drivable.
That's before you even get into trying to tune for the dual-stage intake manifold that the SVT employs, and its reversed VCT arrangement (intake cam, instead of exhaust), because you can't use a Focus ECU. Short of a ton of complicated tuning, you could just swap to a single-stage intake manifold (which would rob even more of the low-end torque that it doesn't have anyway), and delete the VCT (which would do the same).
Lots of headaches and obstacles; it's not as straightforward as it seems at the start.
In my estimation, for the cost of an SVT long block, I would instead just pick up a Jackson Racing supercharger or something and make your own current Zetec more what you want it to be. Probably no difference in cost, and a lot more straightforward.