The power is the least of your concerns. That can easily be spliced in.
Bracketry is gonna be a problem though! You might need to have access to some fabrication tools to make or modify the brackets... I doubt the bolt holes will line up at all.
As for the rear bench, I'm a little worried that the SHO is a wider car than the Contour inside... Might be a tight squeeze!
Whatever you do, make sure it's solid! Having the seat rip itself out of its mounts in an accident would be no good for your health!
