Go to Turboford.org this has been done before on a MG, after all if an inline 6 can be made to fit why not a I-4 turbo...The cost to use an I-4 2000 twin cam turbo is not really to be talked about unless you have a lot of money or are in Canada or the U.K. ie Cosworth RS 500 twin cam etc.. from a breakers yard etc...Or an engine from any of the hot hatch Japanese engines for example. There are differences between the Ford 2.0 or 2.3 so if you want to do this in one shot find any Turbo Ford with a engine , transmission and a good rear end. Think a rusty Ford Thunderbird or Mustang with a 2.3 Turbo but not an SVO, they are getting few and far between...Any good Mustang with a 2.3 can have the SVO bit's put on however there are just so many left.