Regarding black side vents on a white car, I've never seen any that I liked the look of, that weren't painted the same color as the body. But then, I don't like vinyl tops either, so it's just a matter of personal taste. I actually have a vinyl top on my car, but it folds down behind the rear seat!
I'd just paint it the way you want and save some of the body color paint to repaint the vents in case you don't like it that way.
Why not put a Shaker Hood Kit on it, instead of the '69 scoop? I think that would look cool!
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I contend, that for a nation to try to tax itself into prosperity, is like a man standing in a bucket and trying to lift himself up by the handle.
—Winston Churchill
1967 Mustang Convertible - 289-4V w/C4
1992 Bronco - 302 EFI Auto