Haven' tried it yet with the Petty Kit Car. It is based on the Original MPC Super Stocker. You can use the recently reissued Model King releases.
The Petty kit car isn't based on the Super Stock Series kits, the kits in that series are the Mustang, a 69 Camaro, a 70 Monte Carlo, a late 60s GTO, and a Plymouth 'Cuda, these are the only ones I've seen there may be another one or two that I don't know about.
The Petty Kit car chassis could be used as it's a short track style chassis. However since it was manufactured by Chrysler it would be very unlikely that anyone would hang a Mustang body on it. Here are the other cars in the Super Stocker series. To the best of my knowledge these kits have never been re-issued.
Very nice build Bruce.