The heads alone sell for about the same amount as a complete used motor. A quick top end tear down will be worth it if your not gonna pull the engine or tranny. I finally got the shop caught up so im tearing down trannys right now. Believe it or not theyre worth twice as much in parts as they are as is. Make sure to pick the ecu and any other boxes in the engine compartment. AC parts sell really well also. A good set of ac hoses will go for $60 all day long, people usually think there worthless and scrap them out for aluminum.