Corrected for you, as they're both Zeds.
One thing to watch for with the Z32's is the hoses. They're getting on a bit now, hoses going is very common. Fantastic Z cars if you find one that's been well cared for.
Is it a factory immobiliser/alarm, if not could you take it to another alarm expert? Either way, the dealer may palm it off to a alarm expert and charge you extra (double handling).
Are next door neighbours looking forward to looking at your garage? Perhaps they need some greenery to look at............ a pic of your Zed. That will be a good sized garage.