I don't know what year you have but '66 &'67
frame stands for big& small block are different the big block ones are notched different to allow the interlock tab of the bigblock engine/motor mounts.
Dana it helps to let us know that you own a 66 as there are differences with body style changes.
Brett wins the prize for the correct answer, but the small block mounts physically will work but are not as strong.
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