When I bought my 97, the previous owner out superduty front springs on and the truck was able to clear a 36" tire. Only modification you'll have to do is drill out the shackles where the leaf mounts to the appropriate size. Can't remember off the top of my head.
I did an add a leaf up front on my F350 crew long box about 8 years ago, think it was either a Rancho or Superlift - it added a 1 1/2 inches, took away a little of the sag. I dont mind a 2 inch rake but it was more like 4 before that. Diesel engine be heavy!
I since recently had the truck re-sprung at J+D in Williamsport. Still have a 2 inch rake from front to back with 33's, but got 2.5 more lift overall front and back. Now I'm debating 35's or 37's cause them 33's look silly
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