As JPO1970 said, it is not as strong, since the convertible frame is factory boxed. To strengthen my 66 Chevelle frame, I bought a damaged El Camino frame and removed the box sections (the same as a convertible) and stitch welded them to my frame -- looks factory and would give the strength required by the more flexible convertible. I would be hesitant to run the unboxed frame in a convertible.
Pappy
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