Wow! You don't have the canister for adjusting the choke. Hopefully somebody better with Quadrajet carbs can help out on this one. I've had one with a similar choke setup and ended up eliminating it and went to a manual choke with a cable at the dash. The two steele canisters with the hoses to them should hold vacuum. Unhook the hoses from them and push the plunger in on one, put your finger over the end of the hose or fitting on it and see if it holds the plunger down, a minute for each ought to be sufficient. If it lets the plunger back up while you have the port covered, it is not acting as a choke pull off which would open the choke or close it which I'm assuming one of the two does.
Good luck and I'll keep checking this thread as it updates,