Although this is a street bronco, you should still count on using your full range of suspension travel! Clearing larger tires is not only a function of ride height, but also suspension travel, particularly compression. The best way to find out what ride height you need would be to buy some 35" tires first and mount them. Then remove your shocks and springs and cycle your suspension. Find out how much compression you can get and still turn lock to lock without rubbing. Then measure how big your bumpstops will need to be to stop compression at the point you have determined. Keep in mind that bumpstops compress. Order the proper bumpsops separate from your chosen lift kit. Since it is a street truck, I would choose a suspension that would give about three inches of compression before it bottoms out on the bumpstops.
That would be the ideal way to determine how much lift you will need. My wild guess would be about 5.5" of lift and 3" extended bump stops, but I really do not know off hand. Good luck with your build!
