So how big is the car gonna be? I hope it's bigger than a Miata because I'm to tall for one of those. The toyota spyder is to small for me too. I'm 6'3" and I can fit in a civic just fine. I hope the rx8 will be big enough to handle larger/taller americans.

Outer dimensions are identical to the Acura NSX in every way, except the RX-8 is a bit taller.
I'm guessing you should fit just fine.