if your gonna change the rack, lower the rear frame, then undo the lines, adds some room. you need to undo the steering shaft as well.
racks you can get on line, rockauto, napa. just get a reman one.
heres a rack vid, you can do this on your back on the driveway. ive done it two times now.
http://www.steeringrackandpinion.com/video-tutorials/