There just A-arms. If they fail, from being built out of china melted junk, and welded up in a 3rd world country garage by a ddq, what's the worse that can happen
Mains are big for our coast and a stock motor. 27.5s and air screws correct, you should only need 290-maybe 310 mains. Unbolting your intakes and reeds you'll know if it's been ported by what the intakes look like. Unless they only did transfers & exhaust