With no offense meant to anyone, I do NOT understand the NEED for the question???
The Pontiac shop manual says to adjust with the air cleaner in place. So why the debate as to why the AFR changes with the addition of the air cleaner? I cannot understand any circumstance where one would run without the air cleaner; so listen to the shop manual. Pontiac had some pretty good engineers!
Jon.
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"Good carburetion is fuelish hot air". 
"The most expensive carburetor is the wrong one given to you by your neighbor".
If you truly believe that "one size fits all" try walking a mile in your spouse's shoes!
Owner of The Carburetor Shop, LLC (of Missouri).
Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings.
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