76 k10 rare????

[certified]

So i went to see a man about an 84 k20 and while looking at it I noticed a k10 behind the barn and when he told me what it was and that it had no rust I had to take it home along with the 84. Now I bought it because I'm kinda a project hoarder but I've also never seen one like this its a 76 k10 Scottsdale factory 350 4bbl with a 3 speed column shift, was this a common truck or am I correct in thinking that not many were produced? I haven't found another searching anywhere.