When I worked the line at PMD in those years the repairmen would quite often get a repair ticket with "shift body right" or "shift body left" , they would loosen the body mount bolts and simply pry the body over and retighten, job done. This problem was not unusual but not that frequent either but did happen. I guess what I am saying is the body being to one side or the other is a real possibility but when the car was completely stock no one knew. I don't remember the big Pontiacs having this problem, only the A cars.
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