Do you have a longbed now? If so, use a suburban frame, it will be much easier to mount your 67 cab because the frame section under the front/rear seats on the sub will be straight and not raised behind the front seat as is on the 73-up truck frame....
if shortbed, you might get away with a blazer frame, but i believe it would be a few inches too short, but you will have to double-check your measurements.
good luck!
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