Justin,
Wouldn't you be more comfortable with the accuracy of advice directly from the manufacturer? http://www.millerwelds.com is I think the link to Miller; sometimes the exact model and serial will identify variants of the machine.
Did they not respond?
Folks that answer here are undoubtedly qualified to do so. I certainly am not disputing them, but merely think it preferable to contact the manufacturer of the equipment you are considering. They are all helpful in that regard.
Good luck
d