1Heat oven to 350°F. Grease 12-cup fluted tube cake pan with shortening. In small bowl, mix 2 tablespoons of the sugar and 1 teaspoon of the cinnamon. Sprinkle mixture over inside of pan, turning to evenly coat. Shake out any excess.
2In large bowl, mix remaining 1 3/4 cups sugar, remaining 1 teaspoon cinnamon, the flour, baking soda and salt. Reserve 1 tablespoon of the evaporated milk for the topping. Stir remaining evaporated milk, sour cream, melted butter, vanilla and eggs into dry ingredients until well blended. Pour batter in pan.
3Bake 40 to 50 minutes or until toothpick inserted in center comes out clean. Let stand 30 minutes; remove from pan. Cool completely, about 1 hour.
4In small microwavable bowl, melt caramels with reserved evaporated milk uncovered on High 1 to 2 minutes, stirring every 30 seconds, until caramels are melted and mixture is smooth. Drizzle over cooled cake.