Dear List just pulled my P3 engine apart and the camshaft is surprisingly sad. Does anyone know if the P4 75 camshaft is same/similar enough to interchange. My P3 parts list shows the number 213706. Has someone a P4 parts book and can let me know the P4 camshaft part nos? Cheers Gianni 1949 Rover 75, P3 six light 1971 P6B 3500 1974 P6B 3500S