I don't think I've ever seen a Rochester 4 barrel with a manual choke, and I grew up in the 1950's around a shop in Nashville that specialized in carburetor work. You might have some sort of Mickey Mouse conversion unit that was popular with people who didn't understand that automatic chokes are smarter than all drivers and most mechanics. Ditto for automatic transmissions!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!