Cinnamon Coffee Cake

"Mix and set aside: 1 pint sour cream 2 tsp. baking sodaCream together: 2 cups sugar ½ lb butter 1 tsp. vanillaAdd sour cream mixture. Blend wellAdd: 3 cups flour 2 tsp. baking powder ½ tsp. saltAdd: 4 eggs (one at a time)Topping: ½ cup sugar 3 tsp. cinnamon 3/4 cup chopped pecans or walnuts (optional)Grease and flour tube pan.Layer batter-topping-batter-toppingSwirl with a knife to blend slightlyBake: 350 approx. : 60 min"