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Measure 2 cups of milk into a glass measuring cup and add the 2 Tsp of lemon juice. Set aside
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In a large bowl, combine both types of flour, 1-1/2 cups sugar, soda and salt.
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In a small bowl, whisk the eggs, buttermilk mixture, and oil.
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Stir into dry ingredients just until moistened, don't overmix.
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Combine cinnamon and remaining sugar in a small bowl and set aside.
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Spoon half of the batter into two greased loaf pans. Sprinkle with half of the reserved cinnamon -sugar; repeat layers. Cut through batter with a knife to swirl.
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Bake at 350 for 55-60 minutes or until toothpick inserted near center comes out clean.
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Cool in pans for 10 minutes before removing to wire racks.
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Wrap in foil, place in zip bag, and freeze for up to three months.