I am assuming you are DOHC since it says you have a 91.
1. Yes it will work
2. You can put the throttle body anywhere you can run the cable to
3. Depending on what supercharger you run, the m62 comes with a built in bypass actuator that recirculates when at idle etc.
4. You control boost based on what pulley size you run
http://www.youtube.com/watch?v=jN3c_BkQ89M
Theres a clip of mine, good luck.