Magnum manifolds on 67 Dart?
The passenger's side Magnum exhaust manifold will clear okay on an 'A' body, but the driver's side MUST use manaul steering, as the bottom side hits the power steering box by quite a bit.
I don't think grinding to get clearance would overcome this.
And, NO, a Jeep Grand Cherokee driver's side Manifold will NOT work on an 'A' body to clear the steering gear.
In actuality, it's worse.
Mark.