Tire conundrum

Leaf springs:
There are a few people just adding leafs to their existing main leaf from a dakota. I would get a few leafs off a 4x4 .

There are threads on this site about it. If you have a jack a few C clamps and a bit of time you can just do your self up some springs for cheap and adjust your height.

Your wheel backspacing is also probably your other rubbing cause. People get quite wide tires under a bodies with good backspacing setup.