Yep. The Petersen is really cool. I saw it too will out in LaLaLand.
The crazy thing is what you saw is a fraction of the cars they actually have. Not enough room to display them all at once so they rotate them in and out. While I was there they had an exhibit of the Dry Lake Racers from the dawn of the SoCal Hot Rod movement of the late 40's early 50's. Pretty cool cars!