I don't think you have a suspension component issue. Here's why...
If your car, or any vehicle is low, or high at a given corner, the opposite corner of the vehicle will be the opposite in height. For example, if the RIGHT rear of my Chevelle is low an inch compared to the left rear, then my LEFT front will be somewhat higher than my right front. Corner weights work the same way also.
Vince hit the nail on the head. These cars have a variance. It could be that your cars sheet metal has been replaced, and whoever did it didn't keep the car square during that process. I'm guessing, of course. You might have a pristine car that's never had any sheet metal work, rare, but maybe.
Another thing I'd look at if I were you, are the front springs. If they are not seated, or indexed properly, it will throw the rear end heights off, and it would be way more exaggerated at the rear, due to the Novas design of a short front overhang, and a long rear overhang.
Just some thoughts...
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