[46/72 truck guy]

Hey folks, Im a new member but long time truck lover. I just recently bought a 1972 K20 Cheyenne super with a 4 speed manual and 4:10 rear. I would like to change the rear gears to a more highway friendly set. Does anyone have a suggestion as to what gearing I should go with? ie 3:73 or 3:03 Any help would be greatly appreciated.