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In the rest of the U.S., not so bad. In California, it's almost certainly gonna be more money than it's worth.
I think the only way you're gonna make it happen would be to wait for it to be legal for import on the 25 year rolling exemption, import it into a state that doesn't require emissions checks to get something registered, then do a fully BAR'd (i.e. smog-reffed) motorswap from something that's already legal here (the motor will have to be newer than the chassis).
Or, you could just buy a Miata/S2k/Boxter/MR2.