My friend had the same thing with his 1966 Playmouth Barracuda, failed the technical check for blue and black smoke he went to Alkhraetiat there is a good shope for carburators there you might wanna try it, worked like a magic and passed the check.

67 shelby with 2010 engine might as well put a 7 disk CD changer in it. These cars come with crappy stereo system.