Well, as I heard it, Dead Man's Curve was on Sunset Blvd. headed west from Hollywood (matches the order of the streets in the song: La Brea, Crescent Heights and Doheny), and it was supposedly a reverse camber turn just E of UCLA (it banked to the outside of the turn). Sometime in the late 60's/early '70s it was supposedly repaved and they fixed the camber, so, while it's still there, it's no longer quite so deadly.
Hehe, loved that song (and most Jan & Dean stuff).
"Well, the last thing I remember Doc, I started to swerve...."
Keep up the great trivia, Jimdandy!