Judging by the Camaros parked in front, I would say this is from 1968. Kind of interesting, we always assoicate Yenko Chevrolet as selling musclecars, but here, right along side of the SS Camaros, are pickups. Could those be "super trucks"?
Might add, it took a lot of arm twsiting to get the estate to release these to me, as they had always been very protective of such pictures. Since acquiring them I have enjoyed sharing them, including in a major muscle car publication (no longer in publication). As far as I know, these are the only two from that era known to exist, at least that have I seen of the outside. I do have a couple of the inside.