Depends on a few things:
1. Do you actually want to convert the car to an SVT(or as close as possible)?
2. Or are you just talking about swapping the engine/tranny(and accessories)for the increase in power?
3. Or maybe somewhere in between? Engine/tranny and exterior parts?
Some options will cost a lot more than others, obviously, and that will give us a better idea of what you want.
Regardless, for the cost of even a basic engine/tranny swap you could buy/install an HMS turbo on that Zetec(4cyl) and have equivalent performance.
Edit: One more thing, for years, SVTs were only produced in 98, 99, 00. There was a 98.5 model year Contour(and SVT)in which some things changed on the cars and there have been discrepencies about what actually changed. You're best bet would be to look at 99 and 00 SVTs so you wouldn't have to worry about these 'discrepencies'. HTH.
