If your heads are original to your car/engine, you'll see the provisions for the thermactor tubes adjacent to the spark plug holes. If you have these additional ports(holes) they should have a plug in them. If not present, you didn't have a factory smog/thermactor equipped system and shouldn't have to worry about adding a system before you register your car. As Jeff also stated, and man-o-man is he right, it is California, and They could change the law back again, requiring pre-73 cars to have to be smog certified at a State smog station, every other year.
Our San Jose, 1-6-66 fastback has a Los Angeles DSO and had the factory smog equipment on it (bought in 1987). I lived in Ventura (30 years) and pulled all the smog equipment off the car as soon as they passed the law down there, exempting pre-73 autos. I debated the removal & plugging up everything in the beginning but I saved all the parts (along with our original black and gold plates too) as we now live in Poulsbo, WA. Decided not to again live in CA, am happy as a clam, returning to my native Western Washington finally. I know what you mean about the car, and never wanting to let go of it, now that you have it (dreams becoming reality). Me too, believe me...just wanting to put ours back exactly as it was from the factory now, so when people see it at shows, it's representative of a factory thermactor-equipped system, honestly and pretty rare to see up here, as it has turned out. Restored and put the CA plates back on last year too, for the 3 to 4 shows we attend every year. Looks genuinely iconic for reasons I can’t really describe, that black and gold on this particular car. Fun stuff. Wish you all the best in your decisions to re-locate.