307 question 1970 c10

[Rmax]

I have not been on in a bit I got the trans in I used a trans jack that I found on eBay it was cake of a job, thanks. The two section drive line was different for me and took me a min to figure out.
I am back on because the eng stopped on me just as I was pulling into my house. I cranked her over and there was a clicking sound but I had oil pressure so I thought to start with the top end. I found 4 bent push rods and the timing chain was off and the cam sprocket teeth were warn out. I ordered a new cam, lifters, timing chain set and pushrods from summit and it is back together just set the valves. Thought I would ask why this happened? To me the teeth were warn out and the chain has stretched and came off. I want to make sure I fixed the problem before I crank the eng? any other ideas of why?
thanks for you time as always