[TerrysSPF]

Like others have stated here, I would look into the LoneStar. Back when I was originally looking for Cobra's I drove a LS and I couldn't believe the room it had (although I'm only around 6.0 - 6.1 and 210lbs).
I have to say though that my father has driven my SPF without any problems, and he's around 6.4 and probably pushing 265lbs. The thing to do with 90" cars is to take the seat rails out and mount the seat directly to the floor where you feel comfortable. I know several "large" guys that have done that without any problems.