2:7? gear set?

Why not consider buying another center. You can get a good
used center from many of the great guys right here. I have
2 different ones myself. 3.23 and 3.91s. Works great if you
want to go racing and then just swap them out to go highway
hauling.
I'm running the 3.91 right now. But when I take it on Power
Tour I will put in the 3.23s.