Make the Spiced Pound Cake: Preheat the oven to 325 degrees F.

Prepare a bundt pan with an even coating of shortening and flour. Place chopped pecans evenly in the bottom of the bundt pan.

In the bowl of a mixer, cream butter and sugars together, beating until fluffy, about 3 minutes. Add eggs, 1 at a time, beating well after each addition. Add vanilla, cinnamon, allspice, cloves, and ginger. Sift together flour, baking soda, and salt; add flour mixture to egg mixture alternating the buttermilk, and beginning and ending with the flour. Pour into prepared bundt pan and bake for 1 hour and 15 minutes. Cool in the pan for 15 minutes, turn out onto wire rack to cool partially, and then place on a cake plate.

Make the Orange Rum Glaze: Stir together the sugar, cornstarch, and salt in small saucepan. Add juice and water mixture, zest, and rum. Cook over medium heat until bubbly, stirring constantly. Remove from heat and add butter and vanilla; stir. Pour approximately half of the glaze over the warm cake. Reserve remaining glaze for serving with the cake.

Make the Chocolate Sauce: Place corn syrup and chocolate in a microwave-safe container. Microwave for 1 minute on high and then stir to melt chocolate. Add butter and vanilla and whisk until chocolate is thoroughly combined. Drizzle over cooled cake and serve.