Sorry Paul,Chevrolet did not ever publish this kind of information.They did publish how many ,and what type [340.400.and 425 hp] engines were sold that year,just not what they went into.
We on a 63 Biscayne that was an original 425hp car, I got it back in '75 and I know where it came from back as far as '72 from Cali as it had a Black plate on it that year, like a dumbass I got the motor first then sold it, then bought the car and could never get the motor back. Even to this day I have never seen another 425hp Biscayne here in MN. in over 45 years so a Bel Air wagon would be quite rare.