Frame vin?
 

I tried Googlin' with no luck, so I'll try the experts. I have a 54 truck body to put on one of two S10 frames that I have. I know one is a 82 but dont have a clue about the other. Is there a vin or any other markings on the frame to tell what year it is? Are there any differences that make one better than the other anyway? Thanks.