simply the fact you changed the carbs will cause it to fail doesn't matter if the exhaust is cleaner than the air. Also the motor doesn't belong in the car. You might be able to get through, but it's still not legal.

CA has lame laws about these things, I know I thought propane is cleaner than petrol, so that should be easy to get through the smog refree... nope. if it doesn't have a CARB # for your engine application, too bad no matter how clean they won't pass it.

Putting a different engine in a vehicle isn't ok either, nor is using a different transmission, or changing anything.

but those things only matter if someone is doing the smog check properly.