[wtm442]

Sorry to disagree (slightly).

Turn the engine off.
Remove both sight screws, and gently nudge the car ... if gas just trickles out of the sight hole, the level is correct. I hate fires and gas stains on manifolds.

If nothing comes out of the sight holes, adjust the screw no more than 1/8 turn and lock it down (actually, maybe a 1/16 of a turn will be enough). Start engine and nudge car after 30 seconds or so ... if gas trickles out of the sight hole, the level is now correct. If not, repeat 1/16 turn of screw and recheck.

If the gas continually flows out of the sight plug hole, the level is too high. Of course, you have a rag under the carb to collect the gas and reduce the chance of a fire???? Turn off engine. Put sight plug back into bowl, adjust level screw 1/16 turn.

a) Remove one of the bottom screws that hold the secondary bowl to the carb (use paper cup to keep gas off intake manifold). Remove a couple of ounces of gas. Reinstall screw. Start engine and let it idle for a minute. Remove sight screw and nudge car, etc.

OR

b) For primary bowl, start engine to use up the excessive gas in the primary bowl. Remove sight screw and nudge car, etc.

OK, now both bowls are correct. Take the car for a 5 minute drive. Park on level ground and check both bowls again. Why you ask? That is because 90% of people make a LARGE 1/2 turn or greater adjustment and still have the level screwed up. Small adjustments only.