Try these guys out as wellhttp://www.isuzuperformance.com/isupage/
What car is the engine in?
Does the smoke smell of oil or diesel? If oil look at the turbo If diesel there must be a problem with the pump injectors or timing. If you had the cam belt off did it go on correctly timed.
Running hot could be timing or a bad turbo but could also be a blocked or worn out radiator. Also if the car did not have this engine originally the radiator might be too small or the pipes might be kinked
Sanding your knuckles before starting work can help. That way you cant skin them