On-sale date from copyright registration.
Pencils credit per Bob Klein, Gene Reed, Mike Tiefenbacher, and Bob Hughes. 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 of 7.67 pages each.
On the page immediately preceding page 9 of "Superman's Secret Master!"