Fuel pressure should be steady for sure, if you use a reasonable fuel pump, mechanical it will give you a good steady 6psi. Float settings are very important, the adjustment can be knock out in the shipping and handling of the carb.

A dry carb from lack of daily use is totally acceptable, it was never notice over previous years because we drove the cars all the time. Today the cars we play with will sit from week to week. My hotrod sits M - F, Saturday I go out to play I spin the motor over to get oil pressure, pump the accelerator a few times when the pressure is up. I do that then cause I know the carb bowl has filled, turn on the ignition power, hit the button again and bingo it fires right up. Come Sunday go out, flip the ignition power on, hit the starter button, instant roar.

It is different driving these old cars, the FI on todays cars eliminates this type of stuff. Unable to just stuff it at idle and launch, there are a lot of variables to solve that one.

Just some food for thought, watching a drag race, monster power and all, notice they never just launch from idle. Why cause the amount of fuel they can pump into that bullet would choke it. They bring the Rs up to have more air flow or volume to match the amount of fuel thats coming when the hammer comes down.

So in my humble opinion the stumble from idle I read in most post is a result of to much fuel being ingested for a set amount of engine variables, volume, timing, gearing and the list could go on.