If you are not into clean custom cars, maybe you are into functional, mean, and savvy. There is one place to see ultimate Post Apocalypse cars and that is at Wasteland Weekend.
Wasteland Weekend is a huge community of wastelanders who get together and pay out if there was a real post-apocalypse world. They barter and trade instead of purchase, they wear items that keep them secure and intimidation, and most of all they love the brutal world that is to come when we run out of oil, get nuked, or just plain run out of natural resources.
If you do not end up going for the community, at least go for the cars!
Mad Max will never die!