The Convertibles are better cars as far as driving and ambience is concerned. One important mechanical improvement related to the rear suspension. Regarding this particular car, I guess the modern engine is the better practical option, but there is something special about that canted-over sideways M189 engine and its visual appeal. Hard to ignore originality, and if I had a choice, my preference would be the original unit. The wheels ? I love the originals with their hubcaps. Regards. Styria