If I were to put a 91 T2 in my 86 N/A what do I need to get so that the 91 engine would run smoothly??Like a 91 drivetrain?ecu?transmission??

 

89-91 ECU and harness for it. You can use the NA tranny but you will need to use a T2 clutch. The NA tranny is slightly weaker but you can use it.

Try searching for "engine swap" or something similar.

Oh, you would also need a T2 hood