Butter 13x9x2-inch pan. Combine chocolate chips, German chocolate, marshmallow cream and nuts in bowl. Set aside.
In heavy saucepan combine sugar, salt, butter and evaporated milk. Let stand about 5 minutes. Heat to boiling, stirring constantly. Boil 7 1/2 minutes after it has a good start to boil. Pour at once over chocolate mixture Stir vigorously until chocolate has melted and mixture is smooth and creamy.
Pour into prepared pan. Let stand several hours or overnight to set. Cut into squares. Store, tightly covered. Freezes well.