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Bolting a Model-B carburetor onto a Model-A manifold gains little because of the draw-tube restriction of the manifold. A Model-A manifold has a 1.000" draw tube opening whereas the Model-B intake is 1.250". You can exchange the 'A' intake for a 'B' intake manifold however the 'B' has the flange skewed differently than what you find on the 'A', so that requires machining the flange holes to be able to rotate the carburetor. IMO, it is better to purchase/modify a Model-A intake manifold that has been machined oversized to reap the benefit of the larger throat size of the 'B' carburetor.