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If you have no vacuum the engine probably wouldn't run and idle, the engine is creating vacuum, but it might not be reaching the Hdyrovac booster. Even without the booster working, the system was designed to deliver manual brakes with more peddle pressure needed. If the peddle goes to the floor then you have an issue regardless of the booster. I would pull all of the drums first before you even put brake fluid in the master cylinder. If you have leaking wheel cylinders you might have a chance of saving the shoes if you don't pump more fluid into the drums. As far as tires, you could call Shrader and see if they have any 20".