I went from a plus 8 to a mk 1 roadster. Not quite the same as 3.7 I know.
The roadster was quicker and more agile....a brilliant touring car. We went all over France with it and it was terrific fun.
The only thing it lacked was the sound. It was that step to modernity that the factory was beginning to take.
Now, today, the one car of all the mogs I've owned that I wish I still had, is the plus 8....it was just more romantic.
Nick