-64 Dart steering coupling

Well no kidding, I didn't say they would, only that certain magnum manifolds WILL work. I'm not sure what your point is other than you feeling a little jumpy this morning.

It's a much more cost effective way to get some "decent" flow on a street car. For what the engine is, they will be loads better than the 273, and headers, for that engine, aren't going to do much more and not enough to justify the cost in my "opinion" and so I offered an alternative that he migtht not have otherwise explored.

At the end of the day, I don't have a dog in the fight, nor do you. So again, not sure what your point is.
No, not at all. I know for a fact and back, that the Magnum manifolds do work but not on all cars without some clearancing, because not all these cars are the same. I have a friend in north Georgia who put some on a Duster, which as we know is a lot wider than a 64 in the engine bay. They hit the steering coupler. He had to grind that driver's side down pretty good before it cleared. So no, I wasn't "jumpy" at all. I just left a part of my post out. My bad.