This Shock Gibson story is also in Speed Comics 27. And there it says, ' Art previously credited as: pencils - Jack Kirby ?, inks - Joe Simon ?, never credited as such in TwoMorrows Kirby Checklist. Correction from Bud Plant, 2006-12-5.' Also it is signed by Glantzman. I have aways thought that had Sam wanted to do superheroes and science fiction ( rather than the more realistic War, Sword and action material he obviously preferred) He would have been Kirby's equal. The story is about a Big Gun, which would be the sort of technology Sam would have been interested in. An interesting one.
Link to the book:
Super-Dooper Comics 7