pan to bake a pound cake
Will it will fit is an easy one. Go here: http://www.joyofbaking.com/PanSizes.html.
All but the biggest tube pan is less volume than a 9X13X2 pan.

As for how long it will bake- I don't have the ability to compute the exact new bake time; however, the rectangular pan will produce a thinner cake so the baking time will be reduced. 

I would put it in for 3/4 the recipe time and then start checking it at 10 minutes intervals.