Dual exhaust for my 273, 2, 2 1/4 or 2.5

So I am trying to decide what to run. It has a 2" single on there right now. The motor has been rebuilt to a little over factory some years ago. Not sure what all has been done(second owner and all). But I want to open it up some drone the manifolds, with that said what should I run. I am leaning toward the 2.5" but I'm not sure if that's a bit overkill for my setup. Thanks for the input all.