Not a 1967 owner, but have some documentation.
According to the 1967 Pontiac Quality Control Inspectors Guide:
Manifest code 5 ID code FC 3-speed manual
Manifest code W ID code FO 4-speed wide ratio
Manifest code 8 ID code FT 4-speed close ratio
Manifest code X ID code PT Auto 400-2bbl engine
Manifest code J ID code PS Auto 400-4bbl
DSIB 67-I-76 is dated 21 August 1967.
Hope this helps.
Jon.
__________________
"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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