There is a vent hose barb for the canister purge and I believe both small vacuum ports are ported instead of one manifold and one ported port. You just use an adapter on the rear of the carb or an intake source if you need manifold vacuum. Other then that there are slight jetting differences since it is an "economy carb" instead of a "performance carb". A jet kit fixes this, you'll probably need that kit to fine tune either carb anyways.
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