I am looking for specification details on the changes in the 1973 240z vs the 1972 model year. Reason ... I am looking for a 240z for vintage racing and to qualify the car must be produced on or before December 31, 1972. I would like to include 1973 model years in my search but to get a post-1972 production car to qualify, I need to demonstrate that the 1973 240z retains the same visual appearance and mechanical components as a 1972 model. At this point the only difference I am aware of is the SU carbs changed in 1973. Any other differences?