I have heard 9000. Mostly due to the shorter stroke motor. The main thing I would be worried about is that all the components match. Intake, Heads, and Valvetrain. You will probably use a single plane intake with a high cfm head and a stiff valvespring. If you figure out what Heads and Intake you are going to run, you can call a cam company and they will help you with your selection. They do it all day long so I would trust them first. Also, look into Aluminum Heads. CNC Heads flow really well and carry big valves.
JEff
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84 Regal Project GBodyGMachine
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