Hi!
You would be correct in thinking your motor is worth more. You should be able to get around $800 for it- depending on its condition (seal leakage, compression, damage- if any.) If you want to try selling it, throw it up on ebay. You may get what you are asking for there. Keep in mind, though, this is a common motor. It was used in a lot of the GM truck line, and this will affect what you get for it. It also depends on what you will be leaving on the motor as well. If you are going to be removing all the accesories, the injectors, and the wiring harness, you may get less for it.
You shouldn't run into any problems installing this new stroker motor in your truck. It's a real straight forward swap. You may have to change the fuel setup a little depending on the amount of horsepower you are looking for, but everything else should be an even trade.
Let me know if you have any more questions!
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