You really don't want to open this can of worms. It is not a simple job to "bolt on" a rack and pinion. Especially when you try to use a rack that wasn't designed for your non-rack suspension... There are a lot of design criteria that needs to be met to have a rack work correctly with an existing non-rack suspension. Bump steer, ackerman and turning radius are just a couple that will haunt you mercilessly. Do a search here on "bump steer" and you will find a few threads that discuss this.
Read this and do some research...
You would be much farther ahead to simply put on a quicker ratio recirc. ball box and rebuild your current suspension. There is really no gain to be had with a rack and pinion that would out-weigh the problems you will create by trying to adapt one.