Camshafts and Compression

I have made a mistake in post #266 by suggesting to block the pri main jets. Since they also supply the idle jets, there would be fuel for idle. You would need to measure the idle jet & main jet sizes, & calculate the difference. Then block the jets with something of that area such that the only fuel that passes the m/jet is equivalent in area to the idle jet. No fuel left for the main system.
The important thing to remember with carbs like this is that any fuel from the main system that enters the t/bores can only do so by exiting the booster nozzle. There are no other holes or passages from the main system that exit into the pri t/bore. If the main system is adding fuel at idle, you will see fuel exiting the booster. If you do not see fuel, then it is NOT adding fuel.