What ignition and plug gap?
My thoughts are if it ain't broken, don't fix it
I use to change plugs at the track after every race, I would leave the old ones in it to warm the car up in the pits and then put the new ones in
I had cans of spark plugs that had from 10 to 16 runs on them
Once I switched to the MSD race gold ignition boxes and their matching coil I didn't need to do that anymore