I’m in CA with an 84. Mine doesn’t smoke but runs very rich. You can smell it at idle. Yet it passed 2 years ago with a CARB legal Catalytic Convertor that I got from Rock Auto for around $200. Also the rich smell went away. Until I changed it back to the old CC 3 days later knowing it would be destroyed by the unburned hydrocarbons. I’m pretty sure my original injectors need cleaning. Poor gas mileage.

some places check the smoke more than others. My guy revs it and then runs around to the back to check. So try 50 weight For the smoke and a new cat for the Nox.

edit. Unfortunately the only CARB cat they have now is $436 at RockAuto