There is restoration and restoration. Strictly speaking, to restore a vehicle is to return it to some previous state. We accept restore to mean 'as new' though there is much interpretation to this.....
In the case you cite Mike, your Matador could be restored in any of it's previous guises, all would be correct.
As for originality, I think most of us accept that there will and indeed must be compromises in some areas such as tyres, batteries, canvas and such.
I think the phrase 'as original' is more correct.
At the end of the day, it's up to the owner.