The NNC07 mod best represents that era/style of car in my opinion, but the mod is difficult to paint for because of the warp in the front end. I uploaded a picture to the post that shows the warp in action on the Toyota model.
HOWEVER! I believe there's debate on whether or not the carviewer files (which I believe there are many since this mod was also known as the NNS08 and Nationwide) are corrupted; meaning the cars won't look like this in-game, depending on which version/date created mod you're using? I'm not too well versed on the subject, maybe someone else can shed some light.