Hi dougers,
The best way to test if you fit, is to find a Barchetta and sit in it.
I am 193cm and I fit without problems.
I tested a mazda mx5 2 years ago, and the seller did not close the roof, he was sure he would not sell that car to me.
Five years ago I was looking to buy a 2 door Freelander, but after several tries, I had to asume that 1 small finger space between my head and the roof was not enough for driving that car on a bumpy road or even off road.