Thanks for all the great comments.
This car featured in the magazine published by the 75 and ZT enthusiasts club which said that it may have been a special order car, as a V6 on a MK2.
Other odd bits(but probably just down to parts bins) was that it had the MK2 oak dash but Mk1 clocks?
This car could easily have been heading to scrap or breaking at £290 with next to no MOT. I'm glad I rescued it and that I don 't have any more space to store any more. It's an expensive hobby!