ive fitted a replacement 2000cc engine to my 1971 p6 but i dont know what year car the engine has come from. the engine number is 44604412 a, as i am having problems with the clutch now (stopped working) i am having to remove the engine again,the workshop manual states the clutch pressure plates are different on the early models to the later ones. it appears my car is a mk 1 1/2 due to been built with both mk2 and some mk1 parts from the factory. any help would be most appreciated.