As Mike posted, the vehicle serial number (ID) is on a plate on the cab between the driver's door hinges.
If it has the original engine, that will also help to ID the year. The engine serial number is pressed into the block, just to the rear of where the distributor goes into the block.
After we see the engine information, I'll post a link to information on where to find engine and head codes.
Rust is the major factor affecting value. If you can do metal work, that would be a good thing. Sheet metal parts for COEs are much harder to find, compared to conventional cab parts.
