IIRC, if it's a 3/4 ton it will have a longer frame and a long, step-side bed. These longer trucks have been put on a K10 long bed frame and made into a 4X4 using the original drivetrain. IMO they are wicked cool.
We had a '53 long step-side back on the farm. It was wore out when my dad bought it and it wasn't a pleasant truck to drive but I always liked the look. Who would have thought that all these years later these vehicles would be cool. Ours had the 3-window cab and I still prefer those. You often see them in Alaska in some field or sitting under a tarp in someone's back yard.