Nothing has changed on the floor where the seat brackets mount. I might have the rear seat adjuster too low, which I will check. Otherwise a couple of spacers to raise the back up will do the trick
I don't know if it spacer the passenger seat height to match, Don. If your power rack is the 6 way rack, that is. It is designed to have height adjustment to fit the driver. Unless every future driver likes the seat at the same height, they will never always be the same. I had a matched set of split bench, power driver seat from a 74 Newport and they were never the same.
On the other hand, it will be the next owner's issue to make the height match for him/her. Lol
