Bring a large pot of water to a boil. Add a generous amount of salt (at least 2 tablespoons) and the pasta and stir to separate. Cook until 3 minutes short of al dente (according to package directions), then drain.
Meanwhile, heat the oil in a large straight-sided skillet over medium heat. Add the garlic and cook until fragrant and sizzling, 2 to 3 minutes. Add the pepper flakes and crushed tomatoes, season with salt and cook until the tomatoes are slightly softened, about 5 minutes. Add the wine and bring to a boil for 1 minute. Add the clams and cover for 2 to 3 minutes. Uncover and cook, stirring, until the clams open. Discard unopened clams.
Add the pasta to the skillet along with the parsley, cheese and butter. Cook, tossing and stirring and drizzling with olive oil, until the pasta is cooked through and the sauce is silky and thickened. Serve drizzled with oil and sprinkled with cheese and parsley.