Place oven rack in the middle of the oven. Preheat oven to 325 degrees. Spray a 1o cup Bundt pan with nonstick cooking spray. Set aside.
In a medium mixing bowl, whisk together flour, salt, baking powder and baking soda. Set aside.
In a large mixing bowl of a stand-up mixer, beat butter at medium speed until fluffy. Gradually add 2 cups of sugar and continue to beat on medium for 3 minutes. Add eggs one at a time, beating after each addition. Reduce speed to low and flour mixture and buttermilk alternately in batches, beginning and ending with flour and mixing until just incorporated. Stir in vanilla.
Pour batter into prepared pan and bake in preheated oven 50-60 minutes, or until a cake tester or bamboo stick comes out with just a few moist crumbs.
Meanwhile, make the Butter Sauce: In a small saucepan combine 3/4 cup sugar, 1/3 cup butter, water, and vanilla. Cook over medium heat until butter is completely melted. Do not allow mixture to come to a boil.
When cake comes out of the oven, prick surface with a bamboo stick or chopstick, make 30ish holes. Slowly, spoon Butter Sauce over cake. Allow cake to cool completely in the pan before removing.
When cake is completely cooled, make the glaze; Place powdered sugar in a medium bowl. Set aside. Melt butter in microwave then pour over powdered sugar, add 2 Tablespoons of milk and whisk until smooth. Thin glaze as needed with milk. Pour over cake and let sit out until glaze is set.