Highflyer - A previous owner replaced the stock rear axle with a 70's 14 bolt rear. It sits just forward of center. If the springs were able to be reversed it would move the rear axle back about 2 inches, centering it in the rear fender well.
Shell - I believe you would need a new driveshaft since it would be pulled away from the tranny by a couple of inches. Also to consider - hyd brake line and emerg brake lines would need attention, as well as anything else connected to the rear like anti-sway bar, etc.
