Frame Identification number

[degree01]

Hello everyone, can some one tell me where i can find some kind of identification number on my chevy trucks Frame? the thing is that i bought this 66 chevy truck c10 but i belive the frame is from a newer model truck and i need to know what year it was the only numbers i found on the frame were 467539 and 7 292s but i google'd it and did not come up with anything. if any one can give me a website or a different place to look i would really appreciate that. im thinking it might be around late 70's frame but need to be a hundred percent sure.

thank you all in advance.