[spdbrake]

DanEC has some great points. The dizzy stands out in my mind as far as spark scatter or spark reach issues, especially if your advance comes in late (heaviest springs are not all-in until 5.5k)
The adjustable rotor is a worthwhile investment.
I found this video pretty helpful in setting mine up.
[ame]https://www.youtube.com/watch?v=aWMlNwGW0tM[/ame]

All this assuming your running an MSD dizzy.