I'm replacing my 1968 mercruiser 120 with a 1986 mercruiser 140 and the manifold is diff. the 120 exhaust goes between the mounts and the 140 goes out side the mount, I cant use the 140 system for clearance issues. And the 120 manifold is shot. Which manifold do I need? I have both type of carbs so the only issue is exhaust. Plus the 120 elbow is good so I'de like to keep it.
