The pork cushion is from the shoulder picnic:
it is merchandised into usually pork cube steaks for higher profit yield from the picnic, or chunked/cubed boneless pork when selling the picnic as whole, half or sliced. Packers can sell it as a cased product by itself and is usually a 1 - 2 lb. piece of boneless pork.
You'd want to cook to an internal temp of minimum 145°, 155° - 160° would be more acceptable. If you want to pull them you'd want to go to up to 205° or so. Time would be variable based on the size of the pieces. There is not a lot of internal fat, although some membrane tissue, so pulling may result in a drier product. Again, cooking to temp not time is the way to go; keep accurate smoke logs of all your smokes to refer back to (there is a wiki with logs here to use).