It appears that the FIA has approved replicas to race in FIA sanctioned events. I am sure the cars must race with the homolagated parts, aluminum bodies, transverse leaf springs on 289 cars, Girling brakes, solid rotors, etc. I can't think of a better way to see LeMans, or the Tour de France, or all the other events in Europe.
http://www.fia.com/resources/documen...4_historic.pdf