Too Slow/Q-Jet question

[Cdncarnut]

I have 2 spare Q-jets in my trailer, plus the one on the car, built by the 3 major builders, two of whom have now retired.

I have actually had a case where a carb ran great two weeks ago, would not qualify the car.
Yet, the carb which ran like poop 2 weeks earlier, ran the best ET ever.

I also have one which will get my down the track, significantly under the index, every time.

Getting the rods and hanger correct for race day can be a challenge.

There is no easy answer and really no cheap solution.