What are the symptoms that make you want to replace the front end? Is the steering extremely sloppy or just enough that you want to tighten it up? If you are driving around on the original 40 year old components, then rebuild the whole front end. If its just a little loose and you're on a budget then replace the inner and outer tie rods first. If that doesn't do the trick then the lower and upper ball joints, pitman and idler arm, and all the bushings.