HEADERS
What little experience I have had with BB A body headers. One, I helped on a Duster years ago, it had somebody's under chassis headers. They fit ok, but one side torsion bar had to be removed to put them in. And you had to pull the trans to change the starter.
Two, just helped a guy with a 440 and TTI 2" headers. They hit most of the steering.
I called TTI and they said they probably do! I made spacers to raise the motor. It helped some but not enough. The guy is now going the small block route.