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Preheat oven to 350 degrees and grease two large loaf pans.
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In a small bowl, mix the sour cream and baking soda. Set aside.
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In a large mixing bowl, cream the butter and sugar.
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Add the eggs, pumpkin, and vanilla. Mix well, then add the sour cream/baking soda mixture.
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Add the salt, baking powder, nutmeg, and cloves. Mix well.
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Gradually add the flour and mix well.
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Add the chocolate chips and mix just until distributed throughout the batter.
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Pour the melted chocolate chips into the batter and gently fold in. If using a mixer, turn it on low for only a couple of seconds. You want there to be swirls of chocolate in the batter.
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Pour into the two prepared bread pans and bake for 55-65 minutes, until a toothpick comes out clean.
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Cool on wire racks.