Black smoke after replacing turbos and injector

 It could be due to the intercooler.   Signs of defective intercooler:   black soot and oil at the underside from the leak.

Did he make the 1992 D2 bulldozer costing $500 run

 Thats 33 years old.  The tracks were stuck and the only thing he said that was working was the engine  

And for $500.00 for a running CAT engine, he said the amount was worth it.  Yes he was able to make this run after checking the fuel, and making sure that fuel reaches the injector.   And he was made able to unstuck the tracks.  How amazing.!