Any of the mid-size GM convertible frames for that year will work, but you must use a convertible frame, not the hardtop frame. The hardtop frame is lighter weight and not as rigid as the convertible frame and will flex under the weight of the convertible body, pinching your doors closed. If no suitable convertible frames are available, you can reinforce a hardtop frame by welding angle iron to the frame, but this should be a last resort fix.
Good luck with your project.
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