It depends on where you mount the springs and if you slide the axle forward a bit. I run 33" tires on the White Rabbit with only 2" of front lift, but we did have to trim the back of the fender flares.
How much flex are you going for, and do you plan on building a full 3-link front end? There are a couple of people who have built leaf spring front ends for their SAS conversion due to the simplicity. I also looked at the Calmini Suzuki SAS conversion while at Moab, it is a really nice piece of kit.
What axles are you going to run? Swapping front and rear or just the front? What sort of gearing are you going to use? 33" tires are a pretty big jump and unless your running an automatic or that 1.5 converter from Trail Tough your likely to need to do something to run the bigger tires.