[unruhjonny]

Pontiac Quadrajet parts (fuel bowls, air horns ect) used the same castings for their model year - some castings changed based on the date when the part was manufactured,.

All original 1967 & early 1968 Quadrajets had the disc pad with the application number stamped on a color coded aluminum disc.
All Rochester Quadrajets manufactured after moving away from the identifying disc were stamped regardless of application.

I have understood that original fuel bowls differed by application in how they were finished (eg: bleed tubes and hot air bypass);
Also the application (assembled carburetor) was a combination of all the parts which made up the assembly.
EG: 7040263 & 7040264 used the same fuel bowl, but they were finished and assembled differently.
Some replacement fuel bowls were sold with not number, because they fit several applications - others were sold (AFAIK) stamped for their intended application.

I believe that as time went on, replacement parts were not always exactly the same as the original equipment (OE) parts.

I believe that the people who know how to identify the correct parts, but don't give full public disclosure do so in an attempt to prevent re-stamping shenanigans - and I agree with this.

Be aware;
There are unstamped fuel bowls for 68+ Buicks and Oldsmobiles which show up on ePay;
There are sellers (knowingly, or unknowingly) who are incorrectly listing them as being applicable to Pontiacs, and the list price assumes these are Pontiac RA castings - but they are NOT Pontiac castings.

Years ago, my cousin had an authentic unstamped NOS 1968(?) Pontiac Quadrajet fuel bowl.