Typically the OEM front clip is used on Street Stocks and Super Street Stocks in western ny. What I read into this rule is that you can use a late model style body on the OEM/Camaro front end Chassis. These rules seem to imply that you can build from any OEM front clip that is appropriate to the car or use the Camaro type. This is probably a cost saving measure since the front clip is Original Equipment and someone with limited engineering could produce a competitive car. Free designing a front clip tube chassis or purchasing one can be quite expensive.