Thanks for the input Jon. I wonder if someone can answer this question. I recently read that the 261 had their own Rochester Carburetor with a wider throttle body than the regular 235's Carb. One of these that I have (the 1960's Carb) has a wider throttle body. Is that because its from a 261, or is that simply because in the later years they just went for the bigger throttle body even on 235's? Im wondering if I should practice rebuilding this one, or if its worth sending it to a professional? (it would be my first carb rebuild)