Um, if the motor turns freely $250 is a good deal. Look at the other parts on the car, side shift trans, sway bars (maybe), center console, ect....
The bigger question is do you have a place to store it while parting it out. Then you have to sell the parts, ship them, ect... Don't get me wrong I love a good parts car find but if you have never done it before the labor can be a PITA.