1 may not be a vacuum connection at all, maybe a bowl vent. See if there is vacuum there at idle and off idle. 2 is full vacuum for the heater controls. 3 is the manifold connection for the transmission vacuum modulator.
Number one tube is the filtered air supply that went down and through the exhaust manifold, then up to the choke. This fed hot air to the choke thermostat to open the choke. This feature started in the early '60s. Frank
