I believe MK products make the Lincoln COBRAMATIC. It is a superb push - pull wire feeder. Talking with my welder repair man, he believes it to be no problem at all to wire my Cobramatic to run on my Miller or Lincoln machines. This is something we talked about doing a month ago. The point being that even if it isn't factory wired you can easily make it work. The big 40 is in my opinion a good machine. It will do everything you are asking of it and more.
Respectfully,
Mike Sherman
Shermans Welding