68roofless

Please can someone help me. I have a 68 Convertable mustang, And had a full restoration done. From floor,inner rocker panals, and seat platforms welded in. The problem I have now after I had the Seats redone, is the seats are to high. My head hits the convert. top and my legs are pressed against the stering wheel. Does anyone have any ideas. Every time I get close to finishing this car I run into another problem.
Thanks Dan...