Absolutely LOVE these cars !!! I have all but the Barracuda waiting to be built. These are not cheap or easy to find. If you find one, get it...or I will !!! Paid $225 for the Mustang last month.
For a little more info, cars that use these headers did not have a right side floor or firewall. These kits have a generic big block, as did the old MPC Cup cars. When I finally build 'em, I will fix that !!!
The rear suspensions can be done a million ways. Do it "right", and the Camaro and Mustang will have leaf springs, Chevelle and Monte Carlo will have coils, etc. Of course, these are NOT stock chassis so you can change it up. Back then, some teams ran both.
Someone mentioned using other bodies. I have a Nova, Ventura, and Cougar all waiting for one of my spare chassis. Definitely need to find a Javelin !!!
Although these kits are dirt cars, some of the real ones were NOT !!! The Camaro and Mustang raced on pavement. The Chevelle was a dirt car, saw him race at Kankakee, Sycamore, and Fairbury, IL. The 'Cuda was a USAC team, they ran both. The GTO and Monte Carlo are not familiar to me. With aftermarket wheels and tires, you can go either way and be "right" !!! Mine will be dirt cars... because I said so !!!
If you have never built one of these, you HAVE to get the GTO when it's available. I'm getting at least two, just to have the chassis !!!