You'll have to get everything in front of the throttle body (intake tubes, etc.) and you'll also have to get the (or from an SVO mustang) an intercooler, which is worth about 30 horsepower on those engines. You'll also need the computer and you might want to get a wiring diagram for both your car and a '87-'88 turbo coupe so that you know what sensors may be missing/different. good luck,
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Mustang Parts Specialties ripped me off, it could happen to you as well.
'84 Mustang 5.0 LX
my LX
'89 Mustang GT
my GT