[Noah930]

I think your car originally being a California car will make everything an easy process, from a paperwork perspective. I'd be surprised of there are any import duties or taxes. If you have the original blue plates, you should be able to run those, too. To avoid the hassle of going to a DMV, maybe join the AAA and see if they can process all the paperwork there?

You'll also have to get the car smogged. In general, only cars from '75 and earlier can skip bienniel smog checks. If the car truly is all original, smogging should be easier. California is unusual in that in addition to the sniffer portion (where they run your car on a dyno and measure tailpipe emissions), there is also a visual check. The tech looks at the engine compartment to make sure all original smog equipment is still present (i.e. smog pump, catalytic converter, etc). That last part depends on the acuity/knowledge/motivation of the tech.

I have used AAA for classic car insurance (I think they only insure cars over 40-years-old now for that), and now I have Grundy. That was a lot cheaper than Hagerty for me.

Good luck. There's a reason why Porsche has sold a bazillion cars here.