Truck for sale.....good deal?

If it hasn't been driven much in the past few years it's probably not that "good" of a deal. Engines that aren't driven much tend to collect a lot of deposits in the combustion chamber which affect performance. Also, byproducts of combustion are typically suspended in the oil. If the engine sits for a long period without having the oil changed these byproducts will separate from the oil. Some byproducts are very corrosive and attack bearing surfaces and seals.

My first car, a '64 Plymouth Fury, was driven by a "little old lady" (my grandmother). She wasn't from Pasadena and only drove it to the store and church once a week. I'd stop at the gas station everday to fill-up the oil and check the gas. Eventually I had to rebuild the engine, transmission (ever seen a push-button automatic) and differential. In retrospect I learned a lot about how things work from that car.

Sounds like a deal. If you're really serious about buying it, take it somewhere and have a compression test done. A compression test will give you an accurate indication of how good or bad the engine is. See if the guy has oil change records, too.