What bodies are legal? Trans Am only has a few certified bodies that are very, very expensive. Meanwhile a typical super late model oval track body, very similar to ARCA, is about $3000-$4000 complete with windows. ARCA is a bit more, around $7000.
I have a super late model, but my track closed. I could convert it to a road racing car for less than the cost of a 1990 SM2 Spec Miata. In many ways it would be safer (e.g. fuel cell) and easier to maintain. This is a complete tube frame with 4 door bars covered with 3/16" steel plate.
However, it makes no sense if a $20k body is required.
Can a regular stock car body be used?