Lepke mentioned the small hole in the thermostat. That hole is there for a reason on Lehmans. When I refill my block I open the manifold bleeder and pour in the coolant until coolant begins flowing out of the manifold bleeder. At that point the level in the header tank is about one inch below the top. I have never found an excess of air in the system after running the engine. It's the hole in the stat that lets air to bleed out naturally on both sides of the thermostat as the system is filled. The stat is a common 53mm stat, maybe $8. Simply drill a 3/16 hole in the horizonal surface of the body. Or purchase a $35 stat from Fred Warner or American Diesel with a ready-made hole.
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