Rusty French says: "“You could run a 302 Boss, with a Windsor bottom end and like a Cleveland top. But when we discuss the pros and cons of it, it always comes back to a Windsor. They make a lot more torque and they are not rev-limited.” "Like the bodyshell and panels, one does not need to go back in time to get an older Windsor engine when new ones can just be one click (and a whole lot of PayPal) away". There is some interesting information about rules and restrictions but I got onto this site where Rusty French discloses what went into his TCM Mustang and the photo is Below, also the Link to that viewing is below. . https://autoaction.com.au/2017/12/05/skin-touring-car-masters-ford-mustang-french-connection