Indexed from a scan from Digital Comic Museum (digitalcomicmuseum.com).
John Prentice swipes, possibly associated with Goldfarb (with or without Baer). Though Goldfarb did not work for Ace at this time (according to Jerry Bails' Who's Who).
General American illustrator's style. I don't think it is by Stan Drake or Lou Fine, but Ken Bald is an option - if he did that sort of thing around that time.