buckthorne, you are a midget.
I'm 6' 5" and weight about 300, and I fit in my Superformance. I did do a few modifications that really helped. Let me know if you want to know what I did to my SPF.
sbs1108
There are about a dozen different manufacturers with wheelbases longer than the standard 90 inches. But at your size, you should fit in vertually all brands. Do not rule out any brands until you have sit in that car.
I have a list of manufacturers and their contact info on another thread.
List of Manufacturers