Possible Simon art per Nick Caputo. Previous indexer credited Jack Kirby, although Harry Mendryk only credits Kirby with interior art. Nick concurs with Harry that the cover is not by Kirby.
Stein inks per Harry Mendryk's Simon and Kirby blog:
Stein art per Harry Mendryk's Simon and Kirby blog. Nick Caputo suspects pencils may be by Al Avison.