Thanks for the replies. Being a Jag man it was a bench racing exercise over some pints. E-type are too collectable to trun into a race car so the XJS came to my clouded mind. The engine is very powerful and the stock brakes are also fantastic - huge 4 pot calipers up front with inboard discs at the back - 4 wheel indepentdent - no struts and a very tuneable suspension.
Tom Watkinshaw also had great success with them against the BMW 6 Series in European touring Car. Granted they were greatly modified.
Back to the bench racing and some more pints.