How fast can you go with a Magnum? Who has the quickest setup?

Right! Very good. At 170cc, it is equal to the Edelbrock head, cc wise. So next issue on a daily driver is the ability to flow well at low lifts. More the merry!

I don't know who does what on valve jobs for the best low lift flow rates. But the valve job is (IIRC) responsible for lifts up to .400. Maybe .450. After the .400-.450 lift it becomes more of the bowl area (under the valve) that becomes more responsible for more flow.
9.0-1 is IMO excellent for street use and premium pump gas.