I have a 67 mustang with a 200 six cyl and an original 1v carb on it. I am thinking of updating it to w two barrel weber, but I am not sure what size the intake manifold is. I was told to that it would either be 3 5/8" or 2 3/4" and I amnot sure what size would be on the 67 Mustang. I need to know before I order my new 2v carb so if anyone could help I would really appreciate it.