people bring them in all the time. I live in Portland and there's a guy in town who imports them and fixes them up (@vanlifenorthwest). They've gotten popular tho and aren't the bargains that they once were
A friend of mine bought one; essentially once a car is a classic or something like 25 years old they're not subjected to the same regulations that newer cars have to meet. Since car culture in Japan is very different than here in the states a lot have lived their lives in garages and have really low miles and if you know what model to get, parts are still readily available. The only issue is driving a right hand drive vehicle in this country takes some getting used to. I drove his for a couple of days and right hand turns in particular feel sketchy