1986 Dually with Cummins

[T'S1972]

Ok so I traded my 72 Jimmy for cash and a 1986 Chevy Dually reg cab two wheel drive with a cummins swapped in it. I am unsure at this time what I want to do to this truck. i wouldn't know what to ask for it if i sell it. I am 6' 7"
tall so it is not real comfortable especially having to shift. The interior needs work and the truck could use a paint job, it is rattle canned now, and the interior needs some help. It is presentable as it is but could be much better. The Engine is out of a 1990 Dodge pickup and it has the Getrag 5 speed that is all I know about it. I have driven it about 300 miles in the last couple of days and it runs and drives great, I just not sure what I should do with it.