420 SEL timing chain help!!!

[420SEL Jake]

Guys i need some help. I was driving on the highway when I lost all power and I pulled over and I noticed that there was a large crack in my drivers valve cover. The car's vacuum gauge went through the roof and then I notice the car was not running. The timing chain still spins if i try to start it but looks like there is a slight bump in it while it turns but might be an illusion. There was slight scoring at the top of the valve cover.
Would a broken valve cover stop the car from starting and would could have broken the valve cover?
I noticed that the timing chain seamed to slap a bit after I sat in hot traffic for 20 min... see the picts.