Do you still have cats? What about the smog pump? I can pass with just high-flow cats and no smog pump, and I've got an e-cam with no tune on the computer.
So as long as you have cats and a decent tune, you should be good.
if you're catless idk if you can pass an OBD I pipe sniffer test. Otherwise, I'd suggest running a can of seafoam or GTP through the tank a few days before you take it in to be tested.