[kjewer1]

The 90 TBs are only good for 90 cars. They are worthless to 91-99 owners. 91-99 2.0 TBs are interchangeable.

I believe what you posted about the BBK case is correct. You'll need whatever TPS was meant to work with it (i.e. upgraded TB for a mustang will probably need a mustang TPS, etc). Once he gets that wired in though, he will need some way to set it up so the ECU sees the right voltages at throttle closed and at WOT, as mentioned above.