My experience with seat mods
Have you thought about a Power seat. They generally have more travel than the non powered seats and have a hight adjustment as well. My wife is 4'11" tall and I just put a power seat in my 93 convertable for her. With the seat forward she can reach the pedals just fine, and @ 6' I am fone with the seat at the back of the rails.
Some things to think about if you decide to move your mounting point forward of the factory position. when you pull up the carpet you will probably find the front mounting points are on a sheetmetal box beam. This beam does two things it lifts the front of the seat and provides backward cant, second it is a structural part of the floor pan. Any new mounting points will need to be high enough above the floor pan that the seat rails clear the top of this beam, so you can't just drill a hole in the floor.
Second Your real mounts are probably through the floor pan. If you move these you need to plug the old holes and place buttress plates at the new mounting points. These mounting points take a lot of stress during a wreck, and you don't want your seat pulling loose.
Finally anything you put on the bottom of the car needs to be sealed. If you don't seal your work, water and road salt will get in the crevases and eat up your floor pan in no time.
Good Luck
Uncle Bill
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