Tire size for a leveled 2000 Tundra

I have a stock 2000 Tundra SR5, and I want to purchase Edelbrock VS-3 shocks for the front and back. But since the front of the truck uses coilovers, or struts (whatever they are called), the front shocks can be installed either as stock replacements or with an added 2 inches or so. If i install them with the 2 inches on the front, that should level it out with the back. I am currently running on BFGs 265/70R16s. My question is, whats the biggest i can go on tire size if i install the leveling kit? Also, when i get new tires ill be using the same BFGoodrich All-Terrains.