Early Barracuda Adjustable Seats?

There should be a small chrome knob between the seat & door for fore/aft adjustment. Check out the pics of my '66 Valiant seats (same as '66 Barracuda). The seat, tracks and adjustable risers are shown.

There is a unique "six way seat adjustment" that does require some wrenches. I have a pic from owners manual.

Hope this helps.