ive have seen a few people swap newer beds on to older chevys and a hole load more on ebay. like s10 beds,73-87full size trucks, 80's furd ranger beds , and some unrecognizable ones.
in my opinion none of them looked good ,mostly because of body line not being close.
only reason i could see it happening was if you could get it cheap and needed a bed being the old one was damaged beyond use or missing.
but its your truck and most of the time its not what anyone else thinks.