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Does the car have tubs? Wheely bars? Sounds like the frame is flexing between the rear body mounts and the next-to-rear body mounts. Two suggestions:
Box/stiffen the rear section of the frame. If frame rails were notched for bigger tires/tubs, that could be the flexy spot.
Run braces from the roll cage back to the frame, as far back in the trunk as you can without getting into the sheet metal.
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George W
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