Couple things you can do. You can do strictly a leveling kit, 3/4 or 1 ton springs, or ORE springs to raise the front up 2inches. With that you can do 33s and don't quote me but you might be able to squeeze 35s but won't have much flex. Bigger tires will require different wheels as the stock rims aren't wide enough.
^^^This will eliminate the stock rake and if your like me and don't want the nose to stick way up if ya load er down you can also do the above along with doing an add-a-leaf in the rear. Don't use blocks as they can be dangerous and increase axle wrap.
Lastly upgrading to bigger tires it is highly recommended that you regear. 33s like 4.10s and 35s like 4.56. Don't try to do this cheaply as you will regret it.
Edit: Though you don't HAVE to it is recommended that you upgrade your track bar if you lift it because the stock one isn't the greatest. After 3 inches its basically required but I'd recommend it at 2 inches too just to be sure. I'm sure someone a lil more knowledgeable will post too.