A 74 or 75 Spider won't matter, as they aren't smogged under current Cal law. 76 and newer are. 74 has no catalytic; 75 I think has air pump but no cat? Not certain which year cats first came in on Alfas.
Cal and 49-state cars were the same for Bosch cars, and there were only a couple Calif-only years for Spiders, though I'm not certain which (77, 78?).
So a Bosch car it's not an issue to bring in an out-of-state car. For a Spica Calif car, there were different pumps for 49-state and Cal a couple years, though at this remove, I imagine a good-running car will be able to pass smog on the numbers. You will want to look at the data plate or smog sticker, though to see if it says certifed for fed and Calif. I had a DMV inspector look for such a sticker on a 73 Berlina, which doesn't need a smog check, but she looked anyway. Luckily the sticker was till there. You might want to verify all this, and try to get some emissions numbers on a particular car, before you bring it into the state, so you know what you've got.