Evaluating the Rochester 2-Jet carb:

(Opinion) The Rochester 2-Jet (also known as 2-G) is one of the very finest 2 barrel carbs ever built at any time, anywhere, and regardless of cost!

I don't like the long time to get gas to the carb, but first things first.

BEFORE AGAIN REBUILDING THE CARB:

There are 3 screws on the carburetor that NEED ATTENTION:

Two of the screws are called idle mixture screws, the third is called a curb idle screw.

The idle mixture screws control the amount of idle fuel which is delivered to the engine. These are pointed screws located in the cast iron throttle body and have springs around to screws to prevent them from loosening due to vibration.

One by one, GENTLY turn these screws IN (clockwise) until they are LIGHTLY SEATED or snug. DO NOT TIGHTEN! Now turn them out (counter-clockwise) one and one-half turns. These will need attention later, as this is out too far, but lets get it running and then adjust.

The third screw (the curb idle screw) is probably located in the throttle arm (the arm to which the linkage from the footfeet is attached). At some point in the travel of this screw, the throttle arm should begin to rotate. Turn the screw until you observe this rotation.

Now:

(1) turn the screw OUT (counter-clockwise) until the arm stops rotating
(2) turn the screw IN (clockwise) one-half turn past where the arm begins rotating
(3) acquire an old ketchup or mustard squeeze bottle. Empty the bottle and clean it well
(4) fill the bottle with fresh fuel
(5) there is a vent in the very top of the carburetor in the general area of the choke.
(6) fill the carburetor bowl using fuel from the squeeze body
(7) feed a teaspoon of fuel to the engine as you have been doing (this will not be necessary later) and start the engine. It MAY now idle at a higher speed, this is good.
(8) after 10 seconds or so, gently begin to push in the choke.

Jon.

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop