You have probably seen mine at www.engalt.com/kr2.htm under the engine section. It worked good for me. Not so sure how well it would work with the Ellison carb. I had the updraft Zenith which necessitated an extended lower center section of the cowl so it was easy to run the air intake line under the oil cooler. I also had a separate carb and cooler inlet in the cowl. With the Ellison I am assuming that you have it mounted right under the engine and don't have the cowl coming down as far as I did and would have it behind the cooler if you mounted the cooler like I did. Of course, that may not be a real bad location either. It would give you warm, but likely not hot, air off of the cooler into the carb. My gut feeling is that would halp to atomize the mixture and would help reduce the chance of carb ice without the air being so hot that it would decrease your power noticeably.
Brian Kraut Engineering Alternatives, Inc. www.engalt.com
