If your looking for a T350 then get in touch with a TVR specialist as Im sure you are aware they do have a reputation. I used to work for an independant dealer but luckily I worked on the Lotus side and not the TVR.
One thing we used to do alot, to older TVR’s and not T350’s, was replace chassis out-riggers which meant a body off rebuild. They were a mud trap down just behind the front wheels where the diagonal brace meets the bottom of the “A” post.
So if you are looking at one get an expert to check it out first…