I think I just might.
Did it have a Federal (round tube filler neck) or a Saginaw power steering box? I had a Federal in my Dart and if I did quick manuvers like a fast U-turn, it would fluctuate like that. My Cuda always had a saginaw pump and never did that, even in a autocross where you are constantly sawing the steering wheel back and forth....Well swapped the pump out of the dart for a Saginaw one. No issues since.
Yes, there is more header clearance. I brought up the Flaming River box, because the cost of a used one, then sending it to Firm Feel for a rebuild and then installing the 16:1 guts is nearly the same $$, maybe less...It would be something to consider the price comparison.