Yep, and if you go grinding around on the "B" pillars you'll find some more. It's what Ford used to fill the seams after they welded the roof on.
There are still some old-time bodymen around that swear no version of "Bondo" has ever quite matched the filling qualities of lead. I don't know much about that, but I do know that of all the old cars I've had over the years I've never had to grind off all the lead to repair the rust that had formed underneath it. You sure can't say that about Bondo.