Wrong year yes but does anyone know??

[gcm]

Does anyone know if in 1964 chevy offered the 327 small block in their c10 trucks? everything I am finding says the first year it was offered was in 1965 but the guys says they were offered so its just a 1964 327 that he is replacing the original with as in trucks the engine and the truck didn't match they are more so if its a correct year that matches the truck. Now I was aware of that but in checking I cant see any case or any site that says 327 was in any trucks before 1965....this is a bad match right?

thanks for any comments and help you guys offer