How to sell a used engine?

First, engines are best sold locally since shipping is $$$$. I bought 2 engines in the last 3 years via craigslist. Best if they can run the engine to check for blow-by gases. You can sometimes do that with it out of the car (Mopars need a tranny connected to start). Otherwise, you can turn the engine over by hand w/ a socket wrench and feel for the compression from each piston (4/rev for a V-8 ). In a good engine, it feels like an air spring and you can hear the pressure hiss down over >5 sec.