Log with the Predator??? Can I do this while making a pass? What about timing? Put more or less with RPM increase?

Thanks! I'm asking because:
1. The motor is in a 68 Dart bracket car.
2. It run's 12:95 in Las Vegas, it should run at least 12:50's
3. Ive only added about 10% fuel @ 5-7 RPM band and about 5% in the lower 2 RPM group
4. From your reply's... Dyno is the best tuning tool?

Is it safe to max out the fuel levels in the lower two rpm bands? I have a 04-5.7 hemi in a 68 dart. It ET's pretty good but I think it can do more.