You've got parts that are or soon will be 40 years old, and normal wear on the tie-rod ends, ball joints, sway bar bushings, etc, etc is going to give you excessive play in the system. A quick "google" here 1973 shows that you can get a total rebuild kit for $310
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I would think if you haven't done this it would be (or should have been) the first step. Now that said, if you're having a shop do your work that $310 will probably become about $1500 or more - they'll be looking to get retail list for each of the parts, and then it's a labor intensive job to drop all of those parts, count threads to keep the alignment close, and then reassemble. Maybe you've already done this?