For a true 33" tire, you could either:
1) Run a 1.25" Body Lift plus a 3/4" bumpstop extension in the rear only.
2) Run no body lift and extend the front bumpstops 1" and the rear bumpstops 1.75" or 2". You can add a few fender washers to a 1.5" bumpstop and make it larger, and you can also cut the bumpstops shorter.
The Body Lift has other advantages and is the best way to go, in combination with a 1" Motor Mount Lift to reduce rear driveshaft angles.