each piece should have a casting number;
A casting number is cast into the part - as opposed to application numbers being roll stamped onto a part of the assembly.
I believe all early (pre-1968) carbs had tags instead of stamped application numbers.
I am not too sure if the 2bbl carbs had a tag attached to a main body screw or not - but I believe that's how I've seen most.
People really in the know will be able to place with in a window of time based on the casting number(s) - as GM assigned them sequentially.
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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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