70 ?
From the pic's I would say it probably is a 70 3/4 ton frame. The previous owner probably changed the cab at some time hence the #s not matching. The front end is a dana 44, and the rear is an eaton. It looks like the ID tag is still on the front diff. ( Tag is under the lower left hand bolt of the front diff cover ) This tag will tell you your gear ratio. Other board members will most likely have additional input for you.
Gary
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