I had a similar problem on a 67 Acadain (Nova). But adding to the stiffness was horrible creaking sounds.
It had bushings and shouldered bolts like yours.
Like rohrt said, the shackles would pinch the bushing ends enough to bind them.
To test the theory, I loosened the nuts and spread the shackles with a pry bar. A quick trip confirmed the problem.
I then ground the bushings ends down a bit and made them cone shaped. When it put it together, I added a washer on the bolt that made the shoulder longer.
It worked.
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