I believe these regs are still in place:
If the car is less than 21 years old, it must comply and pass EPA specs in force at the time the car was made. Cars over 21 years old are not required to be EPA compliant.
All vehicles must comply with DOT safety and anti-theft regs in force at the time of manufacture.
All vehicles must be brought in through a licensed importer with 1.5X bond posting.
Individual hardship cases (car modified for handicap use, ex.) may be considered, but economic loss is not considered a hardship.