As with LeMons, brakes are considered a safety item.
I've advised them to strongly consider a fuel cell, also as a matter of basic safety. The old Sprint Cup tires, on the other hand...that's just good sense.
They told me they run the truck, and I think all their cars, in some sort of "fun" class. They're not competitive. I don't know all the rules for Chump Car, but it's not as big a spectacle as LeMons. They'll let you get away with a lot if you declare upfront that you're not trying to win.
I did have a lot of fun. In spite of being rather melty.