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[Linked Image from i.redd.it]

Another double-page ad from the "Clark Bar Superhero Sweepstakes" contest.
From HOUSE OF MYSTERY 260, Sept 1978.
And DETECTIVE COMICS 479, Sept-Oct 1978.
And BATMAN 303, Sept 1978.
And SECRETS OF HAUNTED HOUSE 13, Sept 1978. And probably all DC titles that month.

I saw the original art for this ad sold recently, and is attributed in the listing to "Neal Adams studios", whether that includes Neal Adams himself, or just those working for him at Continuity Asssociates. It looks to me like it most likely includes Dick Giordano, and possibly Mike Nasser. Bill Sienkiewicz, Bob Wiacek, Bob Mcleod and others were also working there at the time. I love these ads.

I already posted a bunch of them on the previous page, double page ads, featuring both Marvel and DC characters.

It was hilarious in one blog post I read about them, one guy said for all the promotion, there was no one who was ever visibly awarded the winner.
So they might have promoted it, without actually ever giving away any prizes. If you look at the prizes they were offering, it certainly wouldn't have bankrupted them to give away the prizes offered.