Marshmallow Creme Fudge

4 1/2 cups sugar
1 pinch salt
1/2 cup butter
1 can evaporated milk
12 ounces German sweet chocolate
12 ounces semisweet chocolate chips
1 pint marshmallow cream
2 cups chopped nuts

Combine the sugar, salt, butter and milk in a saucepan and bring to a boil. Cook for 6 minutes. Combine remaining ingredients in a large bowl. Add sugar mixture and beat until chocolate is melted and mixture is smooth. Pour into buttered pan and cool. Cut into squares.