400 FSB and a x8 multiplier will give you 3.2 ghz
Depending on your chip and motherboard, I'd guesstimate 1.43 vcore (cpu) as a starting point for stability- mine needs more like 1.47 bios (which is different from the "real" number and will always be higher. cpu-z will get you a real number.)
more voltage usually (but not always) = more stable at higher clocks
basically, add voltage until you can run prime95 for 8+ hours with round-off checking enabled without crashing or getting a roundoff error.
some software to get you started:
in your bios, basically disable everything that you don't need and set as many voltages as possible to "manual." Starting off, you can leave most things at their default settings.
And watch your temperatures (coretemp isn't bad for this)- quads generate a TON of heat; You're unlikely to get much of an overclock with your stock cooling
Rule of thumb for q6600:
to be safe, try to keep your actual (cpu-z) from going much above 1.5 volts, and your core temps (measure under load after ~20 mins of prime95) below 72ish
there's some decent overclocking guides floating around; use search (top right corner)
also, I don't know where the heck you got all that data, but very little of it is actually useful to us. Fill out your rig's specs (go to the "user cp" tab and click "add system" on the left)
If you need any help, just pm me.
edit: I don't know that motherboard real well, but chances are it won't be great for overclocking quads. Not many are