FWIW, in 1994 I took a '71 Buick Centurion with a 455 Rocket to a smog check in Imperial Beach -- after the car had been sitting for more than a year.
It passed, but it cost me a few hundred bucks and I'm pretty sure the emissions-checking hose was connected to a different car. I later found out from the Calif. DMV (in National City, I think) that I could pay a one-time $300 gas-guzzler tax and not have to smog the car. That's what I did the next time it was due, but I don't know if that's changed. The car had been previously registered in Montana, with no smog equipment installed at the factory.
I traded the car away to a dude in Poway before I left for Europe in '97; no idea what became of it. As far as I know, the 455 was going to be hooked to an early '70s Cadillac front-wheel-drive transaxle and installed in a Corvair.
I got a '71 Moto Guzzi for the Buick.