Here is a breakdown for ya: C= decade, 60's, 6= year in the decade, which would be then 1966, A= Galaxie, E= Engine (letter prefix to represent engineering departments, like chassis, body, axle), 9425= basic part number, that could be the number used to identify the intake manifold, and finally the G= design change whatever that means. All this info is courtesy of Warner Robert. I would find your v.i.n number and it should be 6(letter)(number number)(letter)this letter will tell what engine you have, example z is a 390 4v 300 hp, Q is a 428 4v 345 hp and so on. An example is 6A63Z145667, that z is you're engine code. Hope I've helped.