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Stock springs and pushrods fail even with the stock Ls1 cam at 5000 rpm. I have seen it happen, the pushrod was bent in 2 places and broke in half. I would do both but thats just my opinion.
Choosing a cam is another story. A zo6 cam is not worth the effort in my opinion. Its a good cam if ran with 243 heads but if your doing cam only then step up a few notches.