Harry Mendryk in his Kirby Museum blog for 16 June 2012 states that the penciler of this cover was Joe Simon, and explains why it looks like Kirby: https://kirbymuseum.org/blogs/simonandkirby/archives/4467
Contents page with new material by Joe Simon. Info per Harry Mendryk's site: http://kirbymuseum.org/blogs/simonandkirby/archives/4467
ink credits per Harry Mendryk's site: http://kirbymuseum.org/blogs/simonandkirby/archives/4467
writer credits per Martin O'Hearn's site: http://martinohearn.blogspot.com/
House ad for Black Cat Mystic # 61.