Hard to say without seeing the truck and knowing its overall condition.
More or less, what is it worth to you?
If the engine and trans is good and usable to you, thats got to be worth a few grand in your eyes.
Yes its likely going to be a VE pumped engine. May or may not be intercooled/aftercooled.
If the guy wants more than that, then you need to do some thinking. If its an aluminum body, thats worth a few dollars in scrap aluminum and a few pennies in steel (if its all steel, its not really worth a damn for scrap). You can make back a bit of money selling the remainder of the truck for scrap either way, but its definitely nice to make back a few dollars if the initial purchase price was a little more than you had anticipated.
2007 Laramie 3500, Just breakin in the new engine with a few trinkets
2004.5 3500 600 series 2wd 6spd bone stock, my little rice burner
1997 SLT 2500, 5.5" fabtech, 36x13.5 IROKs, 5x12s, s300, 4kgsk