If I remember right, the spacing between the legs is about 1.5" narrower on the Ford wing. The legs look identical, except for the pentastar or F-oval on the inside. Mounted on a car, you'd never notice the difference.
Not an a-body, but me and a friend painted the top half of my Aspen a few years ago. We used the SEM Hot Rod Black kit from KMS Tools.
Very low-buck. We did zero bodywork. No primer. We sanded the top half, blew it off, wiped it down and sprayed it. We did the whole job in my buddy's...
I'm not a big fan of the 'fake' aged look, on cars, trucks, clothes or guitars. All my stuff seems to wear out on it's own, no need to give any of it a headstart.