I have the 2" body spacers, and cranked up torsion bars on an AWD and I had to cut and bend the wheel wells a lot to make my 31s fit, however I have seen a 4" body lift clear slightly bigger than a 31.. it was a metric size i do not recall, but it fit.. I think 33s will be tough to fit without rubbing, even with trimming..
Do you have the body cladding? From the pic it does not look like you do, and if not, you have more room than I do since i do have it.