Look back at photos in Chris V's post.
What you have there is a 1965 base (not an early 64 style) that's been rattle canned as others have suggested. The angled in area at the finger pull is a dead giveaway of the later style base. My April 1964 built car has the strait finger pull area, and are chrome. I also, like others have stated, have never seen a 64 or 65 that was black. yours being a later, 1965 base makes the whole issue a mute point really....
Good luck with your project!