Best as i can tell for sure from that angle, but it looks like a 67 frame, here's a couple pic's, one 67 the other with the dimple. i will add tho that i was under the impression that 67's didn't have a frame stamp, someone correct me if i'm wrong.
http://67-72chevytrucks.com/vboard/s...09&postcount=6
http://67-72chevytrucks.com/vboard/s...40&postcount=1