Whisk together flour, white sugar, brown sugar, baking soda, baking powder, salt, nutmeg, cinnamon and cloves in a large mixing bowl until well mixed. Add melted butter, sour cream, buttermilk, eggs, vanilla extract and pears stirring with a spoon to mix well. Fold in nuts. Pour into a well sprayed 10 inch bundt pan. Bake in preheated 350 degree oven 60 to 70 minutes checking to make sure cake is done on the inside. Cool for 20 to 25 minutes and remove from pan. Let cool. Combine the topping ingredients mixing well and drizzle over cake.