Bring a large pot of water to a boil for cooking the pasts. Add salt and pasta and cook for 6 to 8 minutes or until al dente. Drain and return to the pot to keep warm.
While the pasta is cooking, heat the oil and butter in a large skillet. Add garlic and shallots and saute' for 2 minutes over low heat, stirring often. Raise heat to medium, add wine, clam juice and pepper and simmer for 2 minutes. Add shrimp, spreading them evenly over the skillet, and simmer over med-low heat for about 3 min, until cooked through. Stir in parsley. Taste and add salt if needed. Pour sauce over pasta in the pot. Toss gently, but thoroughly, then spoon out onto serving plates. I serve this with pieces of Cuban or French bread to dunk in the sauce.