Mopar circle track question

I have found no info on setting one up or tips on building a good roll cage for a unibody so far. I think you would pretty much be on your own to figure it out. It probably would be more expensive by quite a bit to build too. I'm thinking about the pure stock class in my area and I'm having a hard time just finding a suitable body. They either have too much rust or if they are in decent shape they want more money than it's worth to make it in to stock car. I may have finally found a 74 Charger body that was used once for an enduro race years ago. I need to check it out and see how much rust it has.