A 33X12.50 wont fit. You can lift it as high as the sky, but the tire is just too wide...if you dont believe; try a search. You can find 33X10.50 and X9.50 and possibly some 34s of the same widths. There was a guy recently who came asking the same Q's; gave himt he same answer, he did it anyway and I believe he finally changed his mind...dont remember what he did (cut or went to skinnier tire), but he had to see to believe for himself. Save yourself the dilemna.
Now if you want to lift it, which is great...lots of good products with a better than stock ride...let us know what kind of driving you want to do, but, really, most of the Bronco-specific vendors carry really nice springs and suspension kits. I would stay away from most things you will find at your average 4x4 shop (Sky-stiffer, super-stiff, Rancho, etc). Let us know what you are building it for and you will get more opinions then you cared to hear. Best of luck.