Preheat oven to 350 F and grease a 9 X 13 baking dish.
Soak the raisins in 3 Tbsp. bourbon for 15 minutes, stir well, making sure all of the raisins get wet with bourbon.
*If you're using stale bread you can skip this step. Toast the bread cubes in the oven for 10 minutes to dry them out slightly, enhancing its ability to soak up the milk mixture. Add cut dried bread cubes to greased 9 x 13 baking dish.
In a large mixing bowl add the sugar and melted butter, then stir to combine.
Then add the vanilla and spices. Stir well. Then stir in the eggs.
Lastly, add all of the milk and give it one final good stir.
Pour the mixture atop the bread cubes evenly and allow to soak for 30 minutes. Use a spoon or spatula to push the cubes down into the mixture so they all soak up the liquid. (If you go a little longer that's fine)
Once the raisins are done soaking go ahead and sprinkle them on top of the bread mixture evenly. Before baking, I like to use the spatula or a butter knife just to poke some raisins down into the bread.
Bake for 50 minutes total, top is golden brown and a toothpick comes out clean.