There used to be a guy in SF (since retired) who'd get my 383 RR to pass (with the MP 284/484 cam no less): if the tune-up was fresh, he'd raise the idle speed, pull timing out, lean the idle screws, and get the motor HOT (210-220). Motor was not happy with that but it would pass with room to spare, and I'd just reset everything later. IIRC, same deal on the Hemi car.