Casey, I am betting that they WILL use the chassis from either the Monte Carlo or the Buick Grand National- it will save them a ton of development costs and allow them to bring the kit to market quicker. While I think it will be a popular kit, it won't be a huge seller like a 69 Camaro or 57 Chevy, so they will have to cut corners to be profitable.
I agree that they will milk this kit for several versions, stock, drag, maybe even a 442 or Hurst, whatever they can!