If you are really set on selling it, that may change after you drive it a while, then my suggestion would be....... well, there are a number of routes you could take.
- e-bay, or any of the hundreds of other electronic car lots out there
- find a Datsun owners group and advertise there
- put it out front of your house / other good location
- sell it to me for $600
I don't have any car selling suggestions that are really creative. I rarely sell a car after I have bought it.