Cook shells in salted water according to maufacturer's deirections. Drain.
Preheat oven to 375 degrees and lightly grease a 9x13-inch pan.
In a large bowl, stir together pulled pork, green onion, ricotta cheese, garlic powder, red pepper flakes, salt, pepper, mozzarella cheese, and Colby Jack cheese.
In a medium bowl, stir together pasta sauce and bbq sauce. Spread about 1/2 a cup in the bottom of the prepared baking dish.
Stuff shells with pulled pork mixture. Place in baking dish.
Pour remaining sauce over shells. Sprinkle with reserved green onion.
Cover with aluminum foil and bake for 20 minutes.Uncover and bake another 15 to 20 minutes. Serve.