I'd go with the top end porting, headers, and a good cat back exhaust. You should be close to 400rwhp with these mods (typical stocker dynos around 330rwhp). That should do the job provide the Z06 isn't heavily modified. The gears would probably help as well but there has been some debate on this lately.
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Robert
ZR-1 Net Registry Oregon State Director
91 ZR-1 #431 Black/Black LPE 368
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