Lightly butter one 9 x 13-inch pan. In a large bowl, combine the milk chocolate, semi-sweet chocolate, butter, marshmallow cream, and nuts. Combine the evaporated milk and sugar in a large saucepan over medium heat. Stir constantly and bring to a boil for 4 minutes. Pour hot sugar mixture over chocolate mixture and stir with large spoon until well blended (do this quickly before fudge begins to harden). Once this is well blended, pour fudge into prepared baking pan. Spread out and smooth into pan. Set aside to cool and harden, about 6 hours. Cut into 1-inch squares when ready to serve.
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