Matt - you have a number problem. The number is NOT invalid, but is not a Pontiac, nor is it even an AFB.
Do you possibly mean 3123s, which is a Pontiac 1962 Carter AFB for manual transmission?
If so, it is a toughie. I think we only have a couple.
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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