I would correct that, what is interesting is to see a leaf spring car for the engine bay picture of the Griffith Homologation and in fact the Willment Coupe CSX2131 if taking the origin of that pic to the full extent....
Then I would say, how is it possible the 400 runs on the homologation of the 200? Aren't they different and not just bodywork? If so that isn't covered by the special body rule of Appendix J of period.
Added to that, would the TVR crew put together a base of documentation and period pictures of the cars in order to truthfully detail what these were back exactly?
But a car just came up on bringatrailer.com which is supposedly a standard 200 road car from 1965, an interesting car for suspension, parts and all to look at. I won't say it's perfect and period as it's had a life but at least it shows what they may have truly looked like.