I am 6 3 @ about 250 and I ran a 17 inch seat with a rap around head brace. The problem I found is that I have long legs and used a 10 deg. seat to move may A** back as far as you can. My seat back was against the rear tin all the way to the floor. Now with that I had to put a longer steering shaft in to move the wheel back...then it was hard to get out. So, a 1.5 inches longer steering shaft and a 1.5 inch spacer on the wheel and then removed the lower nut on the steering shaft big hemi to change the angle. Now with all this said it does take some time to get us bigger driver into these cars. Also my buddie that raced too but is shorter than me, but taller from the belt to his head, cound NOT fit into my car...so good luck