I've been a fan of those A-100's ever since I was kid, and they were brand new. Actually, one of the key designers who worked on that trucks styling had alot to do with several other of my favorite cars.
His name was Chuck Mashigan. He was directly responsible for the port hole window on the T-Bird, as well as the Continental Spare on the '56 Bird and the fin design of the '57's. He later worked on the 4 seater Birds, and I believe he designed the hood scoop that was on the '58, '59 and '60 T-Bird.
He then transferred to Chrysler in the early 60's, and was very involved in the Chrysler Turbin car and the Darts also.
The remainder of his career was spent at AMC where his first creation was the Tarpon, (essentially a Rambler American that had a Marlin roofline). Later on he was responsible for much of the AMX styling. I do believe the 1970 AMX hood scoop was a direct "rip off" of the '58 T-Birds, (at least when viewed thru the windshield) but since it was his design in the first place, he felt it was OK to use it again.
There's alot to read about him if you Google him. He went from driving a dump truck, to working in Fords Styling Studios (in the mid '50's) with no formal training, practically over night.