Heat oven to 350°F. Lightly grease 13x9-inch (3-quart) glass baking dish. Crumble sausage into large saucepan. Cook over medium-high heat until sausage is browned and thoroughly cooked, stirring frequently. Remove sausage from saucepan; drain. Set aside.
In same large saucepan, melt 6 tablespoons of the butter. Add flour; stir with wire whisk until smooth. Cook over low heat for 1 minute, stirring constantly. Gradually stir in milk. Cook, stirring constantly until bubbly and thickened. Add cooked sausage, mushrooms, bacon pieces and pepper; mix well. Set aside.
In large bowl, beat eggs, evaporated milk and salt with wire whisk until well blended. Melt remaining 2 tablespoons butter in large skillet over medium heat. Add egg mixture; cook, stirring occasionally, until firm but still moist. 4. Pour 1/3 of sauce into greased baking dish. Top with half of egg mixture. Repeat layers. Top with remaining sauce.
Separate dough into 10 biscuits. Cut each into quarters. Place biscuit pieces, points up, over sauce.
Bake at 350°F. for 20 to 25 minutes or until mixture is thoroughly heated and biscuits are golden brown.