Mike,
I think Kyle makes a good point, but here are some measurements from my '79 Alumaweld for reference. My seats are mounted on a storage box and are about 8in below the gunnel. This is measured to the lowest point near the center of the seat. The box itself is about 9.5 below the gunnel and about 16 above the floor (hull). Height is comfortable and stable but don't know how similar the hull is to yours. Hope this helps!