Tdi disaster

My 2003 VW Jetta TDI has a major problem. The engine has likely been damaged by an oil leak that was not discovered until the oil ran out. I now have much reduced compression (340lbs or less) and the car doesn’t like to start in cold weather and when it does it smokes much. I need to know if it is worth rebuilding and, if so, where I might have this work done. I live in the Chicago area. I may also consider purchasing a used engine and would like advice on how to get this done.

This sounds like a duplicate message.