Never heard of Misano, maybe someone else will chime.
Depending on your torso length, at 6'3", headroom with a helmet might be an issue.
But if your waist is over 38", I think any replacement seats (with bolsters for good lateral support) might be uncomfortably tight. I strongly urge you to test-sit a seat before buying.
Anyway, definitely do your homework before buying seats. Lots of threads on this topic, like this: http://forums.corvetteforum.com/c6-t...seats-fit.html
For racing, search the Autocross & Roadracing forum:
And have a look in the Tech & Perf forum.