Hi Tom, welcome. No difference in the convertible frame. The convertible does use 2 extra body mount/bushings under the firewall but the holes should already be in the frame. Not sure about other A bodies but I believe they're the same, someone will know for sure. The rear end will be different but can be swapped out. I know the A arms are basically the same but some use different bushings.
Good luck, keep us updated on your build.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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