Need pics of 273 4 BBL choke

Have you checked the '66 service manual? They often (but not always) explain what the adjustments do.
Also there were two Master Tech Books about carbs in '66
This one has a lot about the linkages
More About Carburetors (Session 223) from the Master Technician's Service Conference

Master Technician Service Conference - Chrysler's Training for Mechanics