Thermo quad float bowl adjustment

The float level height not being sensitive on a TQ is seen when you’re testing the emission level. The actual driving feel is not an issue in most cases that I have crossed.
I've not been into them that much. Had just one on the 340 swapped into the 70 RR and most the time, that girl wore a Holley spread bore and even a QJ!!!

So what do you reckon the "plus minus" tolerance is?