I’m running 265/75/16 with OME 912, ball joint flipped, torsion bars cranked and original shocks. I had to trim a bit for the front wheels not to rub. You will not be able to fit 33’s without spacers and I doubt it if 1” spacers would be enough. I would go with 2” ones, or actually, with this setup and your usage (a lot of highway…), I would go with smaller tires.
Just my 2 cents…