What kind of 4100 carb is this?

Hi Bill, My son called the other day and said he just bought a carb from a guy who only thought it was a Ford 4 Barrel. My son recognized it as a 4100 but that was it so I had him read the numbers to me. He also sent a pic via e-mail. I thought I knew some 4100 I D numbers but this one stumped me. It is; C4-GE AA on the foot and then on the body in the circle is the number 1.12. I thought that 1.12 was for a big block and that the third letter G was for Comet. But, and here is the BUT, I don't think there were any "Big Block" Comets in 64 other than the A/FX Racers. Can you help decode this for us? Thanks Again for your help. Tom