Don't listen to them!
What year is the motor, and what version? Long block, short block, or maybe if you're really luck an LS motor?
Anyway, before you put it in the truck you should probibly rebuild it, especially if it's been sitting long enough for him to forget about it... You should build it up though, for $1500 or less you can build a meeeaaaannnn 350, but it will be a challenge to get a Chevy motor in a Ford truck... Keep me up to date, I want to see this... If it falls through give me the motor, I'll put it in my Camino