With a 100,000 miles, this is a hard call--
The engine would use oil, and may need a chain, guides, seals, head gasket......run a compression check ect.
Has there been any work performed to the engine?
How much life is left?
Get it as cheap as possible.
$200-$300.00?
Call a couple wrecking yard and ask what they would offer for the truck.
Marlin