It can be done, but really not worth the effort.
You will need all the donor parts from 1970-74 Old's carb, or 73-74 Pontiac carb. These models are the early design with the Hot Air chokes so the parts will fit the early divorced choke models with some effort.
The main casting will need drilled/tapped for the choke pull-off bracket.
It also helps to flatted that area of the carb so the bracket seats against the casting when the screws are tightened up.
By the time you are done modifying an old divorced choke carburetor, the time/funds would have been better spent building a 75 or newer "hot-air" choke carburetor and converting it to an electric choke.
The end result is a better unit all the way around.....Cliff