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Running a 528 wedge, I tried a GPZ years ago, couldn't pull enough to show 3 inch vacuum. Went to a Moroso three vane, got max 10 inch running 50 percent engine speed. I suspect the four vane enhanced Moroso would be ideal, as you can regulate it down and run it fairly slow to get the same results, improving pump life.

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My GPZ will pull 7-8 at idle.
Doug

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You might want to be more interested in what it is pulling at the 1/8 or 1/4 mile which ever you run in other words wide open throttle that counts.That is not a smart remark just saying to much vacuum can do more damage than good on a wet sump engine. I don't know how to spell the fancy word for it,but when you have to much vacuum it dead locks your oil pump.