Correct, there are multi-color vacuum lines under the dash that control where the air comes out. It's a different set of vacuum lines than the ones you held up in the video. I'm going to over explain this for clarity, not to make you feel stupid, or be condescending. Frequently we have people on this forum afraid to ask questions because they are afraid they will expose a lack of knowledge. The vent control switch (the switch that controls where the air goes; windshield, your face, your balls, etc) on your AC control panel is a vacuum switch. On your HVAC box under the dash there are a handful of vacuum solenoids, and the switch directs engine vacuum to these solenoids to open and shut doors inside the HVAC box that determine whether or not you get air on your nuts or not. There could be leaks in that vacuum system anywhere, but the most obvious reason that it's not working is because it has been carb swapped. It's almost a certainty that when the previous owner carb swapped the engine, he neglected to hook up that black vacuum line to the engine. Getting the air to go to different vents is likely an easy fix. You need to run a vacuum line from one of the nipples on the intake to the black line on the back of the vent control switch. Vacuum line is pretty cheap, and you should be able to splice it together with basic vacutite connectors from any parts store.
Getting the AC working might be more complicated. You are going to need to flush the condensor and evaporator. You will need a source of compressed air to do that. Is the factory accessory bracket still on the driver's side of the car? It's a single piece bracket that mounts to the driver's side cylinder head that the AC compressor and power steering pump attach to. You are going to need a new Compressor and lines. The drier cannister also needs to be replaced. If it's still on the firewall, it's been left open for too long, and sucked up too much moisture. Rule of thumb whenever you disconnect an AC line is that you change the drier cannister and orifice tube. There are also electrical control issues that need to be addressed. I know the AC system interfaces with the ECU, and the fan solenoids. You might have to do some custom electric work to get it to work with a carbed engine. It's been done before, but it might take some research. The AC system will need to be charged when it's done. If you haven't done it before, it's better to let a professional do it. The cost of a one time service is about equal to the tools you need to buy to do it.
Kurt