Looking for a good replacement engine

[maddsports]

I am looking at a few engines on Ebay that I could purchase and rebuild to put in one of my truck. It originally had a 2001 isx cummins with no emissions. I found couple of engine engines with few issues one has antifreeze in the oil and another has water in the turbo. I am looking for any advice as to if you think either would be a good candidate for rebuild