PREHEAT oven to 325°F.
BUTTER and lightly flour pan. Sift Swans Down Cake Flour once then measure; set aside.
IN large mixing bowl, cream butter then gradually add sugar beating on medium speed until creamy. Add eggs, one at a time, beating just until blended after each addition. Add Swans Down Cake Flour and heavy whipping cream alternately beating on low speed until just blended as over beating will yield a dry and heavy cake. Add vanilla; for richer flavor, add additional 1 ½ tsp. vanilla extract. Pour into prepared pan.
BAKE approx. 1 hour and 15-30 minutes or until a long tester inserted in center of cake comes out completely clean. Cool in pan on wire rack 15-20 minutes. Remove from pan, and cool completely on wire rack.
COMBINE powdered sugar and butter in medium size bowl. Stir in 2 Tbsp. of heavy cream. If desired, add ¼ tsp. of almond extract or ½ tsp. of vanilla extract. Beat until smooth and creamy, adding more cream 1 Tbsp. at a time if necessary. Drizzle over cooled cake.