Need more leg room

[P. Kennedy]

I would really like to move my driver's seat rearward a few inches.  Has anyone done this?  I figure I could either drill new holes in the floor and relocate the seat rails, or cut new notches in the rear most part of the rails.  I haven't taken a close look yet as it's colder than witches t__ts here in Wisconsin.  Wondering what the most feasible route would be.