How much should I ask for engine.

Hello I was recently in a car accident and now the car is totaled...have a automotive guy that wants to buy the car for the engine what should I ask for....the engine has about 150k miles on it...He ask what I was asking for but have no idea...looking to get some kinda price range to go off...
I looked on ebay and saw that they are selling rebuilt engines for about 1400...so if anybody has the slightest clue I would very much appreciated it...:confused: