Looks like there may be provisions but you should contact U.S Customs directly:
Cars Imported for Other PurposesNonresidents may import an automobile or motorcycle and its usual equipment free of duty for a temporary stay to take part in races or other specific purposes. However, prior written approval from the EPA is required and such approval is granted only to those racing vehicles that EPA deems not capable of safe or practical use on streets and highways. If the contests are for other than money purposes, the vehicle may be admitted for 90 days without formal entry or bond if the CBP officer is satisfied as to the importer's identify and good faith. The vehicle becomes subject to forfeiture if it is not exported or if a bond is not given within 90 days of its importation. Prior written approval must be obtained from DOT. A vehicle may be temporarily imported for testing, demonstration, or racing purposes. A vehicle may be permanently imported for show or display. Written approval from DOT is required and should be obtained before the vehicle is exported from the foreign country to the U.S. Information on how to import a vehicle under show or display is available at DOT's NHTSA Vehicle Importation Regulations website. A vehicle permanently imported for show and display must comply with all U.S. emission requirements as well, and in general must be imported through an EPA-authorized ICI for modification and testing. EPA will not allow the vehicle to be released to its owner until ICI work is complete.
The following vehicles need not conform to emission or safety requirements but may NOT be sold in the U.S. and may require EPA and DOT declarations:
Those imported by nonresidents for personal use not exceeding one year. The vehicle must be exported at the end of that year - there are no exceptions or extensions.
Those belonging to members of foreign armed forces, foreign diplomatic personnel, or other individuals who come within the class of persons for whom free entry has been authorized by the Department of State in accordance with international law.
Those temporarily imported for testing, demonstration, or competition, provided they are not licensed for use, or driven on public roads. These vehicles may be operated on public roads or highways provided the operations are an integral part of the test. Parties responsible for such vehicles must submit proper documents - forms EPA 3520-1 and DOT HS-7 - to CBP at the time entry is made. Also, applicable written approvals from these agencies must be obtained in advance and presented to CBP along with these forms. Remember, the cost to return vehicles that have been refused prior approval can be very high and must be borne by the vehicle owner(s).
This site might be more informative: