Question has been answered many times. There are whole web pages dedicated to your question. Google "r200 swaps" etc.
Search HybridZ and classiczcars.com
Start here:
http://www.zhome.com/ZCMnL/tech/GearRatios.html
http://www.zhome.com/ZCMnL/tech/R200.htm
http://www.jasonparuta.com/?page_id=1507