What distributor do you run?

I got to say I don't remember getting any ET at the track going from a stock distributor and ignition to a full MSD. But there is something to be said for knowing exactly what you adjusting your distributor curve to and from. There is obvious idle and low-rpm quality as well..
Besides not trying to run the best one of your four old rusty distributors....
When you buy a new MSD distributor you know everything is going to be tight and much more precise...