I have a question regarding the Carter WCFB carbs. What is the exact difference between the model numbers on the brass tags? Does it refer to the jetting or is the whole carb completely different? If you are looking for a specific carb can another one be changed or modified to the same specs relatively easy. Carter lists hundreds of numbers for the WCFB and I find it hard to believe that they are all different. Any information would be helpful. Thanks, Hardy C300 [Non-text portions of this message have been removed]