Did you read these links:
http://rotarycarclub.com/rotary_foru...read.php?t=285
http://www.rotaryresurrection.com/2n...to_turbo2.html
Other than the basic, swap it all in and see what happens, we'd probably need specifics as to whats going wrong. If you have all the required parts (including the proper length USDM harness) it should be fairly straight forward since you're keeping it S4.