Aaaaarrrrrgghhhhhhh!!! I'm an idiot! It's a squish type fit. There's a screw that draws 2 beveled pieces together, squeezing the side of the carb. I thought there was only 2 pieces, but the 3rd, the smaller piece, by the head of the screw was jammed in there, holding the carb tight. I tapped it out from the other side, and the carb came right out.

One thing though, it only had a single O ring, but the smaller engines have 2?