If it has no water manifold ports, then its a 7a. If it has water manifold ports and no place for a dizzy, then its an AAN. If it has water manifold ports and a place for the distributor, then its a 3b.
If it has no water manifold ports, then its a 7a. If it has water manifold ports and no place for a dizzy, then its an AAN. If it has water manifold ports and a place for the distributor, then its a 3b.
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