Camshafts and Compression

Val,
The t/blades were open enough to start the main system, which you see as nozzle drip. Already covered all of that.

RRR,
If you think the main jets supply some idle fuel through the boosters, then block the jets & try again. The engine will idle just the same because at idle, the idle jet supplies the only fuel at idle. Only when the pri blades are open too far will the air speed increase enough to generate the DEPRESSION at the booster to initiate the main system [ main jets ]. And you would notice this as fuel coming out of the booster nozzle. There is only two ways that fuel that has passed the m/jet can be discharged into the t/bores: through the idle cct or the main cct [ booster]. Same for all the carbs listed....