Cream Margarine And Sugar Then Beat Until Light And Fluffy. Add Eggs, One At A Time, Beating Well After Each Addition. Stir In Melted Chocolate. Dissolve The Baking Soda In The Buttermilk. Add Alternately With The Flour And Salt To The Batter. Add Vanilla. Stir To Mix Well. Pour Into A Greased Bundt Pan. Bake At 300 Deg F For 90 Minutes Or Until It Tests Done. When Almost Cool Remove From Pan. Drizzle With Chocolate Glaze If Desired.