Lots to think about!

I did,nt get a Rover 75V8 as I wanted a nearly new car at a good price, and the younger cars hold on to a better price than a standard ZT260.
As a matter of interest I,ve had two diesel 75's already and the ride and handling were fine. I road tested a ZT diesel and a ZT260 about two years ago and the 260 it seemed alot softer than the diesel?
Somewhere between a standard 75V8 and the current set up would seem about right to me.

Looking at the work involved it won't be an immediate job