It's a 3/4 ton for sure. You're right about the lack of marker lights indicating it's a '67 but I'd go by the vin #. Someone could have bolted a '67 front end on it. As far as the vin indicating it's a 1/2 ton. maybe someone swapped cabs and everything. Who knows? But if you have 8 lugs front and rear, it's a 3/4 ton.
