Do your interior last would be my advice.
The first mod I would do to any 67-81 F-Body is swapping to solid body mounts. In stock form, the subframe is held to the body with 4 bolts and rubber bushings. Getting the slop out of this area really solidifies the foundation in which all your chassis components operate on. I'm partial to the Pro-Touring F-Body mounts on this subject. They're adjustable and less expensive than the other solid mounts I've seen on the market.
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