Have seen a number of questions on this B.B. and others concerning less than perfect carburetion, when often the problem was carburetor selection. The following is a listing of what Carter recommended for 'high performance street' use on various Pontiac engines:
326 - 9625
350 - 9800
389 - 9625
400 - 9800
421 - 9625
428 - 9800
455 - 9800
9625 is a 625 CFM electric choke square bore carburetor, that has since been superceded by 9635 (same carburetor with EGR port, which can be plugged).
9800 is a 800 CFM electric choke spread bore carburetor with secondary airvalve similiar to the Q-Jet.
Please note these are listed for high performance street use (Carter was assuming modifications such as cam, headers, etc.)
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Good carburetion is fuelish hot air.
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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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