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).
1983 F250 XLT 2WD, 351W, T19, 3.54 Dana 60
1942 GMC 6x4