Shoebox with airrides Tire size help

I am trying to order some www and wondering if 670-15 are going to be too tall for my shoebox with airride. It is notched heavily and currently running 205 70 14. Any help would be greatly appreciated.

 

I wasnt able to fit a 670 in the rear wheel well until i raised the wheel wells. I use trailer fenders.

 

need more details on what you have done-post pics too. stock suspension with air ride? have to figure out wheel offset too.

 

I have 670-15 Goodyears on mine and no problems. BTW the Goodyears have a 4" whitewall and are taller than the Firestone's.