I have the same problem. If you do find a reasonable solution please don't forget to share it. What I did was to take a carb from a Topaz and fab up and adapter plate from two layers of Teflon.It runs, passed the emission test.... but after all that it has a very stiff gas pedal and need to be constant adjustment depending on the weather. Surely there must be an older model carb that will bolt on with out all of these problems. Let us know what you find out. Thanks and good luck!