im 6'2" and with my stock seat, it was back all the way, then forward 1 click and fairly straight up, my problem was my legs are longer then my arms, and if i get in a comfortable position for my legs, i cant reach the steering wheel comfortable with my arms.
That was with stock seats.
I now have Tom Motorsports CF buckets, on buddy club ultra low pro seat rails, witht he seats mounted as low as they'll go, and i find the driving position very comfortable, my legs are more straight out and forward, and i can still reach the steering wheel.