You could take them to a scrapyard. Otherwise im sure you could part it out and try to make some money off of them. The only other option would be to try to sell it on Ebay or Craigslist and you might be able to make some extra cash that way.
You could do a lot of stuff with them. You could get a kit car and put it together and then put the engine in that or you can take it apart and scrap it at your local junk yard. It has a lot of different metal so you could get a quick buck for them.
Well you can scrap them ,rebuild them, or sell them. You can get a little bit of cash from scrapping it but you could make a lot if you rebuild a popular engine and sell it. Just make sure there is a demand for them.