One thing that used to help Model T owners start their balky Tin Lizzies in cold weather (besides jacking up the right rear wheel!) was to fully choke the carb and hand crank the engine for a couple revolutions with the ignition switch off. Then get into the car, turn on the ignition and press the starter rod while choking again. (Be sure to enrichen the fuel mixture maybe 1/2 turn via the GAV!) By pre-fueling the cylinders, you get a head start on providing combustible material right away instead of trusting fuel to reach the cylinders in cold weather by starting the engine the usual way. Cold engines turn over slower than in warm weather, affecting the sucking power through the intake manifold for the fuel to reach the cylinders. Of course, to hand crank and choke the carb at the same time, you either need an extra set of hands or a wire running from the carb's choke lever to the front of the car, which was standard in Model T's. Many Model A carbs have a hole in the bottom of the choke arm for that purpose. If not, simply tie a length of safety wire to bottom of the arm and pull on that.
Marshall