Looks legit to me. Here is a shot of a rear assembled the same day as yours. Not sure what the casting date is however. Your date is not too early and that is not all that uncommon. The 454 cars used a unique yoke with a 9210 stamped onto them so it would be different than the 396 yokes. As far as value goes? I have seen them from as little as $1500 to as much as $4500. Whatever a buyer is willing to pay.
