One more thing I might ad, the reason I mentioned using the EGT readings as a backup to reading the spark plugs is because they are not reliable unless you have one for every cylinder which means you don't have time to read them during a run, and they can be thrown off by camshaft duration, overlap and too large or small primary exhaust headers on a N.A. motor.
The positive thing about a EGT readout of every cylinder is that if you have individual port nossle's you can individually rejet each cylinder to put it where you want it which with a N.A. gas motor would be around 13 to l Air Fuel Ratio, as on a five mile balls out run the climbing engine temp will continue to lean the motor out the further it is under power.
With a mechanical fuel injection, most racers (including me) do not use a high speed leanout (as is typically used in drag racing) for this reason.
Just my opinion, Bob