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If you can't clean/verify the fuel tank contents first, the external gas can with a hose would work. As always, be mindful of fire, don't do it near a space heater or furnace. Keep in mind the fumes stay low, so it could present a fire hazard, even though you don't smell it up high. If the motor sat that long, the valve springs may have taken a set, and the valve seals may be a little hard. Possible the seals may need replaced down the road if she's a smoker. No big deal. I wouldn't be too worried about the electric choke personally, especially if you're going to pre-lube the oil pump. Revving it up may splash a little more oil on the camshaft anyways. Maybe consider changing any rubber fuel related hoses too. Good luck!

I think i would check the gas in the tank and replace the gas with fresh and flush the gas tank as well. All the prep work in the world wont be helpful if the gas in your fuel tank is 20 years old and mostly varnish. Otherwise the list looks pretty thorough.

I would think about looking close at all of the belts and hoses. That would include the two radiator hoses and heater line hoses. Inspect your vacuum lines for dry-rot. If you are going to rebuild the carb, while he carb is off turn the engine over with the fuel line in a container let the engine fuel pump pump some of the gas into the container and check for debris in the fuel before maybe pumping possible sludge and dirt into the fresh built carb. For safety reasons you could disconnect the coil wire so no spark is being generated that could ignite the gas fumes and spreading into the container of gas you are pumping into it. Since you are planning new parts in the distributor which will more than likely change the timing, be sure you have an air cleaner installed to prevent a possible backfire through the carb causing a possible fire. One of our members lost her beautiful triple black 71 SS454 when her husband was working on another car parked next to her SS454 and caused a fire that took both of the cars, their garage and part of their house). Some of this may be overkill, I will leave it up to you. rob