But "Rent-a-Hero" stands out as the only story I've recognized at Harvey as written by Joe Simon himself. I had to look ahead to his work at DC in the Seventies to find a starting point in creating a list of his scripting characteristics; at Harvey in this period, and in the earlier Sixties and the Fifties there, as well as at Archie and Prize and Crestwood, it looks like he was busy enough editing that he relied on writers including Jack Kirby, Jack Oleck, Carl Wessler, Bob Powell, and so on.
As far as the art on this story goes—I can relate to convincing oneself of seeing the work of an artist who isn't there, but I'm going to suggest that that's exactly what's happening when "Rent-a-Hero" is attributed to Joe Orlando. It's certainly easy to see why it is: folks are working backward from Orlando's credited work at Warren and DC from this period.
I would have thought his use of ghosts in those years is notorious by now, but I hope eventually it will sink in.
I can't make out a hint of Orlando on this story. Jerry Grandenetti pencilled it. Period. Is he being inked by someone else? If so, it doesn't much look like Joe Orlando. The latter did work for Simon earlier, but I don't see his art anywhere at Harvey.