Preheat grill. Toast both sides of bread slices on the grill. Rub cut side of garlic cloves on toasted bread to infuse with garlic flavor. Place 1 tomato slice & 1 Tbsp clam meat on each slice of grilled bread.
Arrange on large platter. Sprinkle with Kosher salt and freshly ground pepper, to taste. Drizzle with extra virgin olive oil. Slice arugula or basil leaves in thin strips and distribute over bruschetta.