That is entirely possible as the C3-AA thrust plate cam [306* dur] may have been used in the late 62-early 63 406 drag race engine. That engine was suppose to be a 12 to 1 c/r - 2 x 4 on a "over-under" L/R manifold using the 540/550 cfm Holleys. [FoMoCo carb suffix "C"] Was built for, as I understand the story, the 6 lightweight 62 Galaxies built for drag racing. I could be wrong as I was only 12 y/o when those were built. FYI: The C3AZ-AA cam has 306* duration, .500" lift, 78* overlap. Timing: IO 40 btdc, IC 86* abdc, EO 88* bbdc, EC 38* atdc. [Info from the Muscle Parts Staged Performance book.]