I have seen a stock block z motor blow with a GTM stage 1 TT kit making 500whp this was a friends car I have some pictures of it. Sharpcoop's stock block almost blew at 590whp when he tore down his engine before he built it a bent rod was found. I would not feel safe running a stock block z at 600whp it's on borrowed time. If you are then run E85 or 100 octane at a minimum.
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Driven Motorsports Single Turbo 7675 T4 1.32 A/R 995WHP 780TQ
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