14's fit for sure. I think they've got 11" rotors so depending on how the caliper and bracket is, they may fit right on or with spacers/grinding. Personally i like wires on almost anything, but not newer style impalas. Do a google image search and you'll see a few of them or put yours on and take some pics.
It's not the norm but it would look good I have a pic of one or just go to lowrider general and look for the topic cars you usually don't see as lowriders and its your car do what you want its your car homie me personally I would just me thou