1.) use a gtp pcm, youll need it tuned regardless. the map sensor will need an adaptor. zzp for that.
2.) yes the trans will bolt right up...what year is the trans exactly? gtp and gt driver side axles are the same, passenger side is different, youll need the gtp obviously
3.) try and get a 98-02 GT "trac" button dic and gauge cluster. 97 has tire system on it, i wouldnt use it to be safe.
4.) yes just get the 98-02 lines and fittings