I would be careful if you don't know what all were replaced and why. All seem to be o.k. but I would wanna know why the valves were replaced? It is possible that the belt broke or one of the variators gave up... If it's all been fixed I would want to know what parts went into the engine and if they are the latest and the greatest from Ferrari. Some parts have been updated several times due to reliability issues, just becareful.