Melt Milky Ways and 8 tablespoons butter in double boiler. Let cool. Preheat oven to 350 degrees. Cream remaining butter with sugar. Add eggs one at a time. Add buttermilk alternately with flour and soda. Add vanilla and Milky Way mixture and mix until smooth. Fold in pecans. Pour into greased and floured bundt pan. Bake 1 hour, or until cake tester comes out clean. Cool 15 minutes in pan, then turn out on wire cake rack.