Hi:
Did you have the seat all the way down on the floor? When my wife drives the car she raises the seat almost has high as it can go...my head is on the headliner and I almost kill myself getting in. (I'm 5'10" @ 235 with a 28" inseam). But when I lower the seat all the way down to the floor there is plenty of room topside. I also move the steering wheel all the way in when exiting. Make for a much easier entry and less wear on the seat. 6'3" might be pushing it though.

FYI

GassGhost