That sounds like you are referring to the Mercy 4 kit from Car Kit Inc. Those aren't made anymore but there are probably a few unfinished projects floating around. It wasn't a great replica though. In order to use the front-engine-mounted Camaro the front fenders are made higher. The lines are horrible as a result. The thought was that it would be a quicker build, starting with a decent engine. In reality, it's just as much work, with no way to ever get it to look right.