Factory 4 wheel disc brakes on an early A

I'm not so sure about that. All the "S" parts for the Barracuda, were available on the Valiant. I seem to recall reading about a "S" Valiant about a year ago. However I will admit I could be wrong, as I have never seen any documentation.

You could get it with the suspension and the same motor as The Barracuda but not an S package. I would like to see a Valiant S emblem if so.