Heat oven to 350 degrees F. Grease 13 x 9 inch pan. In small saucepan over low heat, melt 4 oz unsweetened chocolate and 1/2 cup butter, stirring constantly; remove from heat. Cool. In large bowl, beat 2 cups sugar, salt, vanilla and 4 eggs. Stir in melted chocolate mixture just until blended. Lightly spoon flour into measuring cup; level off. Stir in flour just until blended. Spread mixture evenly in prepared pan. Bake at 350 degrees F for 25 to 30 minutes or until set. Cool Spread raspberry preserves over base. In small saucepan over low heat, melt 2 oz semi-sweet chocolate and 1 oz unsweetened chocolate, stirring constantly. Remove from heat. In another small saucepan, bring 1/3 cup sugar and water to a boil; boil 1 minute. In large bowl, beat 2 eggs untill frothy. Gradually add sugar-water mixture and beat on highest speed for 5 minutes or until thick and lemon colored. Gradually add butter a small piece at a time, beating well after each addition. Add melted chocolate and beat until smooth. Spread filling carefully over preserves. In small saucepan over low heat, melt 1 oz unsweetened chocolate and 1 tablespoon butter, stirring constantly. Drizzle over filling. Refrigerate 1 hour; cut into bars. Store in refrigerator. 36 bars.