If your Z's driver seat has a slight lean to the right (like Atl300zxTT says his does)...it's usually from someone using a floor jack at the wrong point - it pushes the floorboard up and creates the lean effect. My Z had the same issue. I took out the driver seat and used a piece of stainless steel pipe w/ a welded rectangular end to bang the floor board back down into it's original position. The pipe worked well since it gave me plenty of vertical leverage that I could pinpoint.
Take your seat out and look at your floor board to see how level it is before you do anything else. Good luck :-)
