Get them rearched and add a full length leaf. I used to have to do this to F250 ford 4x4, the front springs were crap, but after rearching and adding the extra leaf, they were good. Find a truck shop, they are more than capable.

Or, I have taken a leaf out of the rear spring pack, added to the front and done the same thing, cheap. Just need 2 sets of rear springs to get the same length leaf to add to the front. All you need is 2 new center bolts and new u-bolts,U-bolts may even be long enough to use over, but they are cheap so buy new ones. My 2 cents.