67 vs 69 frame?

[dpike97701]

I'm heading down to California next week for work. While I'm there I'm going to look at a 67 C10. From the pictures I've seen it's definitely a 67 cab (small window). Its registered as a 67 and has a 67 VIN. However, the front end sheet metal has definitely been replaced with what looks like 69 sheet metal. The bed has been replaced as well. Are there any distinguishing features that would differentiate a 67 frame from a 69 frame? Want to see if I can identify if its a 67 frame/cab with 69 sheet metal or if its a 69 chassis with a 67 cab. Any suggestions would be appreciated.

DP