What's the best way to sell a good engine

I see them listed for $600.00 $800.00 but the listings are up there for many months. I don’t think they will sell. On the other hand I run two of those engines and can say they are very dependable
All depends on the intake. IF it has the factory 4 or dual quad intakes, the intakes are in high demand and will sell all day long for 500 plus, just for the intake