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1973-1987
Most all of the parts should be interchangeable.
The 1986 C10 (which I have) are interchangeable with the 1973-1987 C10, C20 and C30 and also many parts on the K10, K20 and K30. Depends on which parts but most of the body, interior and beds are interchangeable. You can also exchange sone body parts with the K5 blazer and the C10 to C30/K10 to K30 Suburban like hoods, fenders, bumpers, doors, seats (the blazer and the suburbans had bucket seats) All other parts you can order new in exhausting detail from http://www.lmctruck.com
82-87
Yes I believe actually the 1986 to 1992 Volvo 240 4 doors are all interchangeable parts but I'm not sure for 1985 and earlier models.
yes Generally, the 1986 and older are interchangeable and the 1987 and up are interchangeable, but not with each other.
NO. 1988 is when chevy changed everything.
If its a small block it's endless. Small block parts interchange alot.
YES, Just about everyone of them will.
look under Chevy parts on the web and they can help you
Some of the parts yes. However there is a difference in the 1985 versus the 1986 and newer front body parts. Also the instrument cluster for the 1986 and newer will not work in a 1985 or older. Salavage yards / Auto Recyclers use an interchange tool called the Hollander interchange. The website Car-part.com is where most post their inventory. You can look up a particular part and run a search for it. In the parts are interchangeable and are displayed by model and year. Those results should give you a good frame of reference of which parts are interchangeable for your application.
yes due to the update applied in 2010 they are all different Generally, the 1986 and older are interchangeable and the 1987 and up are interchangeable, but not with each other.