Welcome to Club Cobra Fran ! Have you ever thought of doing a spyder ?
There are certainly plus and minus factors to a spyder, but the headroom issue is solved as well as rearward vision with the right type of mirror. I am biased to the Spyder(full disclosure here) because I have one.
The drawbacks are the different (but still original) windshield and the lack of weather protection.
Here is the Sebring winner..
