Bob Klein, Gene Reed, Mike Tiefenbacher, and Bob Hughes credit pencils to Dick Dillin. Craig Delich and Pat Lang credits pencils to Jim Mooney.
Letters credit from Todd Klein via his Klein Letters blog (18 September 2016, http://kleinletters.com/Blog/ira-schnapp-in-worlds-finest-comics-part-1/).
Story in two chapters (with same overall title): Chapter 1 (8.67 pages) & Chapter 2 (7.67 pages)
in between chapters 1 and 2 of first story.