There are several conversion kits available online that you can use to convert this and more than enough articles on how to do it. It's fairly easy to do. I will give you a few links and let you go from there.

http://www.elitefitness.com/members/...onversion.html

http://www.angelfire.com/droid/kitsn.../HomePage.html

http://www.bodybuilding.com/fun/catfinaplix.htm

http://www.flterfactory.com/