Clive - I'm betting that anything is possible. It's been a long time since I've looked at the back side of a 280 HVAC system. It's all vaccum lines isn't it? I'm betting that they'd be able to hook the cables to the 280Z controls, but just a heads up, it's really tight in there. I have a slight problem with the cables binding, specifically the one for the defroster and the heat, which both run on top of the unit. It gets real snug up there with the defroster lines and the center vents, etc.
Bryan