The artwork is very similar to signed Walter Palais stories in Planet Comics #53, like hands, faces and figure movement, and inking of muscles, and it is very probably his work. He is credited on this feature at this period by Jerry Bails' Who's Who.
Originally credited "Ruben Moreira?", and he and Cataldo can often be hard to keep apart at this time. Compare the rather stiff movement of figures, pointed hat brims in sideview, and the horses with his signed story "Lefty Jim-U.S. Marshal" in Crown Comics #16. He is credited only on ink by Jerry Bails' Who's Who, but the layout of figure movement and horses are all so identical to the signed story, that he probably has done it all.