looking to buy... need opinions!

[yoslvr442]

right now im looking at a 69 c10 stepside short bed.
it looks all original with maybe a weak attempt at a paint job.
it has the inline 6 with a 3 on the tree. body looks solid as does the frame. the wood in the bed is not rotten. od reads 28930 but im sure its 128930. i was curious to know if the 6500 for this truck is a fair price.

also i was wondering what other things i should know. any little tid bits would be awesome.
how common are these and maybe some production numbers would be nice. Let the information fly!!