I agree that the electric heated choke thermostat cap is a good option and cheaper than buying missing choke tubes and elbows. Chances are the reason the choke heat tube was disconnected is because the heat tube inside the intake manifold is corroded through and leaking exhaust gas to the choke on the carb. You're choke on the carb may be in bad shape or destroyed because of it. If the choke is stiff or stuck, that is probably the case.
Anyway if you want to there are 3 choke tubes all together. One on the right side that goes from the manifold to the choke housing on the carb, and one on the left side the goes from the intake to a rubber grommet on the front left side of the carb right behind and under the choke plates. There are also two brass elbows that insert into the 3rd heat tube in the manifold that accepts the other tubes I mentioned.
Either of these places should have all 3 tubes and the elbows. These are T-Bird suppliers, but 1956 Ford and T-Bird are the same for these parts:
www.classictbird.com or
www.tee-bird.com
Sal