Heat 3 tablespoons of oil in a large dutch oven with a lid over moderately high heat until hot (starts to simmer), but not smoking. Add pancetta, stirring occasionally, until crisp, about 5-7 minutes. Add garlic and saute, stirring until golden being careful not to burn- will become bitter.
Stir in clams, broth, wine, and chile flakes and boil, covered until clams open, about 4 to 5 minutes (discard any clams that do not open after 5 minutes). While clams are cooking, cook pasta in a large stock pot (6 qt or larger) of salted boiling water until al dente (under cook by a minute). Drain in a colander, then add to clams with butter and bring back to a simmer, stirring until mixed thoroughly. Finish with parsley, basil, and remaining olive oil. Taste and adjust seasoning to your liking. Serve with warm crusty bread.
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