'72 3/4 4x4 350/350 w/Air Common or rare?

[1972_K5]

Hello I found a pickup fitting the above discription locally and was wondering if that was a fairly common setup or more t'ward the rare side? Around here most all of the 3/4 tons seem to be 2wd. I'm going to go check it out closer after work but assuming it's all original and in ok condition what do you think a fair value would be? I know its hard to judge without pics but it looked pretty straight and rust free flying by at 45mph..