Of course I don't know for sure one way or the other but my question would be why would they use GTO coded engines as replacements? Why not Firebird coded? Or even SR engines that weren't coded at all? They weren't, I suspect, having trouble selling GTOs at the time. And GTO motors and Firebird motors were exactly the same except for the carb. So why would they specify GTO motors? It sounds kind of unbelievable to me.