As I wrote earlier this year, a friend of mine took part in the Carrera Panamericana rally in the Historic B class (for 6-cylinder engines) with a 230SL with a 280SL engine. He's done really well, finishing the race without expensive support crews and no more than additional oil during the race. He had absolutely no mechanical problems.
The main problem he had was that although he started out just trying to finish, he was doing so well, and had so few problems, that he actually wanted to start moving up on the leadership board of the race. Most of his competitors had highly modified, improved or raceworthy cars. The key issues with the Pagoda were, as he put it succinctly: "400 kg's too many, 70 hp short". In the end he finished 31st overall, and 4th in class, and nr's 1, 2 and 3 all drove highly modified Porsche's 911. An excellent contribution I would say.
I'm including some photographs for your enjoyment...
Peter
(ps: the Red Pagoda in the 4th picture belongs to a different team...)