There are others here who will be able to give you more information from the VIN than I can...........but the on-site decoder shows your truck as originally a 351 equipped, 155" wheelbase, F250. The decoder doesn't give the trim package.

Axle code '23' for 1983 is a 3.54 semi-float Dana 60, non limited-slip; 'K' trans is a C6.

Your truck looks clean & straight (it's a month older than my F250).