12 to 14 cups 1-inch cubes day-old white bread, such as French or Italian
7 tablespoons unsalted butter
2 cups heavy cream
4 cups whole milk
6 large eggs
1 ¾ cups plus 2 tablespoons light brown sugar
4 ½ teaspoons pure vanilla extract
1 ½ teaspoons ground cinnamon
½ teaspoon freshly grated nutmeg
¼ teaspoon salt
½ cup raisins
Confectioners' sugar, for garnish
Whiskey Sauce