Yes, shells are gf
The corn tortillas are gluten free, but check the toppings. Their Tacos Tradicionales (traditional tacos) are gluten free with the exception of their "Tripa" (crispy beef intestine). Also, most of their specialty tacos use corn tortillas, but some use flour and/or have gluten in their toppings. Always double check before ordering, but there is a large gluten free taco selection... and try their "Roasted Mexican Corn" for your side!
Probably most of them because they're corn tortillas. Some ingredients are not, though--for example, one contains breaded shrimp.
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