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Great information, at this point did you try aftermarket heads that improved the torq as much as HP, or is the head work mainly a HP improvement for the higher RPM's.
I own, me and the bank, a 2002 Z06, and with Mike's advice, the heads are good enough. So, the heads were not touched except for valve springs, retainers. Mike, More Performance, does not want to port these heads, leave them alone and get the torque/hp from other sources, cam, tuning, etc. for the daily driver, occasional road course, strip.
Personally, I want to drive my z06 to the NC mountains and beaches with decent gas mileage. Thats the beauty of the package, half race car/half daily driver. You can go too far if you want a nice ride to work/trip is the point.