Sorry to poo-poo on what seems like a mystery.
This looks totally legitimate, all day long.
The OHC sprint Quadrajets used a fuel bowl with a side outlet filter - these are the only Pontiac Quadrajets to do so.
That particular Quadrajet is a service replacement;
The second line date code reads: 0364
That date code translates to the "thirty-sixth day of 1974" (5th of February 1974).
I have observed that in some instances the service replacement carb sold by GM some time immediately following the car's model year was one which was stamped with the automatic transmission application code;
Some great examples are:
1968 Ram Air (all) = 7028276
1969 Ram Air (all) = 7029270
1970 Ram Air (all) = 7040270
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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.
1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
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