As has already been said, you'll be using a TMIC. The radiator goes where you would fit a FMIC. Overall, buy yourself a shoehorn. That's the most stuff I can imagine shoving into an Impreza engine bay.
Are you going to swap the car to AWD? (Weren't all 93's FWD?)
So, for the benefit of the masses... does anyone have any advice on what sort of spatial issues are presented by a EG33 turbo? Is there enough space for the up-pipe and down pipe? Does the turbo Impreza cross member help at all or is that completely irrelevant?
I believe that the powertrain part of a boosted EG33 has been covered elsewhere. Any links to those posts?