Heat oven to 250℉.
Spray tube pan with cooking spray and line bottom with parchment paper. Set aside.
In a small bowl, mix together molasses and baking soda. Set aside.
In a large bowl, combine pecans, raisins, and 1/2 cup flour. Set aside.
Combine remaining 3 cups flour, cinnamon, and cloves. Set aside.
In the bowl of a stand mixer fitted with the paddle attachment, beat butter and sugar until light and fluffy, about 3-4 minutes.
Add eggs, one at a time, beating well after each addition.
Mix in molasses and soda mixture.
Stir in flour mixture.
Add pecans and raisins.
Add bourbon last.
Mix until thoroughly combined.
Spoon batter into prepared pan.
Bake for 2 hours, or until cake tests done.