Hate to be a dream crusher here, but this sounds like way too much work. If you have $8k kicking around, why don't you just buy a running WRX wagon, put a black FMIC on it, Impreza hood w/out the scoop, and call it a day? With an Accessport, an STi turbo, STi injectors, up-pipe and turbo back, you can make >350hp all day.

If you want a project, you can RHD swap the Legacy and use it to deliver the mail.