Littlenecks, Roasted Corn, Chorizo and Tomatoes over Spaghetti

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3 tablespoons olive oil, or as needed

1/2 cup chorizo, mild or hot, grilled and cut into bite-size pieces

1 tablespoon garlic, minced

1 tablespoon minced shallots

20 littleneck clams, scrubbed and dried

2 to 3 large leaves fresh basil, chopped or chiffonade (small strips), plus more for garnish 

Pinch red pepper flakes

1/2 cup clam broth

1/4 cup dry white wine

1/2 package spaghetti

2 tablespoons unsalted butter

15 grape or cherry tomatoes, cut in half

2 ears corn, grilled and then shucked and cut off the cob

Kosher salt and freshly ground black pepper