What is a 67 TNT 440 worth?

I'm getting a 67 Chrysler 300 with its original engine, a TNT 440 4 barrel. It has the Magnum manifolds and full dual exhaust. I'm told these engines had the closed chamber 915 heads too. The engine has not ran for many years but is complete and still in the car. I have no carb or air cleaner but otherwise, it is all there. I plan to part out the car and currently do not need another 440 since I still have 3 here at home. What is a fair price? The buyer should assume it to be a rebuildable core. I'm thinking it would be worth more than a 68-71 440 Magnum. Is this reasonable?