Help me find the umph in my 360

I decided to do a breakdown at least get the intake manifold off the engine and see what the cam looks while I was on my 1 hour lunch break. So in the valley there was a chunk if metal that looked to be the end of the cam retainer plate. I stuck my fingers inside the 2 sight holes from inside the valley and still fealt the cam gear and chain still attached. So I'm wondering if the front part of the cam snapped where I can't see it. Or the woodruff key stripped out of the cam and caused the cam retainer plate to snap. And that's why the cam isn't moving when cranking because the gear is just gliding around the cam.

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