The top is a correct one, but they made a change so that the top supposedly sat flatter against the body, not that you would notice in these photos. However, this top could have come from a b or a c, or even a d. It would have been an incredibly complex conversion, and I would want to know what strengthing was done to the body to prevent it folding in half.
They all have the chrome sills along the window edge.
Not only the 300 badge, but also the two chrome strips above and below where the badge should be. Unfortunately, the photos are not clear or large enough to see it all properly.