2014 MLB League with one historic replacement?
 

I can't seem to figure this out, tho' it seem's simple:D

What I would like to do is set up a 2014 MLB league, but replace a present team, with a historic team of the same name (i.e. I would like, in this instance, replace the present day Mariner's, with the 2001 team to see how they would do).

So how do I do this? (I'll need a step-by-step for I'm easily confused from over thinking everything...lol)

Thanks!