Agree with Tinker about Emerson. He has lowered foot boxes, narrowed transmission tunnels, and made about any modification possible. He has even moved the cowl bar forward and opened up an extra 6" on some Classic roadsters. If you can't find one that fits you ok, he would be a good person to talk to. He built one car for a guy that was 6'6' and weighed right at 300 pounds and he had no problem with getting in or out and the pedals were custom mounted so they worked great for him.
Ron