I've just done this once, but it does take several heat and cool cycles to get all the air out.
Jack the hind end of the car up and open the vent at the top of the radiator. Fill from the pressure tank until coolant dribbles from the petcock, assuming you have a Fluidyne radiator. Shut petcock, Fill everything to capacity and warm the car just enough so the thermostat opens. Let cool. Repeat.
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