I am 6'3", 30-31" inseam, size 10.5 foot. This time last year I was 385 with a 54/56" waist. While I fit in an standard airplane seat, I used a belt extension. That being said, I drove my speedster everywhere (with the top down - no way in hell with it up). My car has the typical slotted back spyder style seats and I use the old fashioned bayonet/simpson style race lap belts that came with the car when it was new. I also run a banjo steering wheel. I think they are 14" - not small in any way.
Since losing over 100 pounds what I have noticed it that my legs are much further away from the gear shift - I would catch myself resting my leg on it here and there in the past. Gear changes are easier (probably because my gut is no longer in the way of leaning forward).
Everyone is build/carries their weight differently, so I don't want to make false promises. When I graduated undergrad I was 245, but with a 32" waist. I have broad shoulders and chest. As well, you are 4" shorter than me.
Bottom line is that I was a big guy and had no issues.
Edit: this pic was from last May when I was at my heaviest, taking the girls to school.