In the bench drawer of my father's are all out vintage fuel stuff. I've always wondered what these were for. Especially since we until very recently only dealt with 2 cylinder mercs and these AJ50A, are linked together for joint butterfly control and they have the choke linkage as well, basically the whole assembly, obviously from a 4 cylinder. Did a little search on the Internet and see 1956 Mark 25 and it seems Mark 55? Any other applications? Mark 30? What year for the Mark 55 or other engines.

Thanks