You're right. But logically the extension on the adaptor block should be on the rear left corner and then it would seem simple. The way it is now, when the adaptor plate is mounted the extension is in the left front portion of the carb. If I could flip the adaptor upside down it would seem to be in the right place. It is as though the adaptor block is not designed properly. But I am expecting some photos from someone who successfully did the conversion, and hopefully that will help!