My first post, but guess you start somewhere. But a few tips ;
Whilst the wild forms of the TVR's will probably work better with wide angle lenses than most cars would, I would still treat them like other cars - go long ! Use your 70-200 and get back from the car. You will show off the beauty of the shapes much better - the Griffith for example is a sleek car, and very simple and clean - you can see in the sample shots above that a longer lens will suit the forms better. Stand back, and zoom in, reduce that perspective. There is enough going on with the body work without having to distort it more it with a wide angle lens. Going low always helps, but not too low - try to still be high enough to see the tops of both doors in your shots. And if you get a chance to go very high, TVR's work quite nicely in more plan view.
Look at some images of the TVR's on the net (press shots).
I always thought this original shot was fab.
http://www.bluechipcars.co.uk/tvr-griffith.asp
It accentuates the width nicely, and avoids the droopy nose that you get on more side views like
http://news.bbc.co.uk/1/hi/in_pictures/6066248.stm (click throught to David Harvey's Griffith shot)
And that goes for most TVRs, the more 'front' front three quarter work better than more 'side' front three quarters - if that makes sense.
And as others have said before on this forum, if you can turn the front wheels slightly so the face of the alloy becomes less elliptical from your viewpoint that always helps.
I would only get out the wide angle for more abstract close up detail shots.
Hope this helps and just have lots of fun.
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