Tom, do you know if the yearly counts are stated as "calendar year" or "model year"?

I would think 426 block production was combined for '65 also

from a couple different sources -
model year 426 HEMI production cars w/VIN (426 cu.in. production):
1964 ~ 180
1965 ~ 203 (6,929)
1966 ~ 2,731 (3,629)
1967 ~ 1,274 (1,258)
1968 ~ 2,511 (2,400 "rounded to 100s" * & I'd bet B0/L0 not counted)
1969 ~ 2,100
1970 ~ 1,656
1971 ~ 403 (486)

11,058+ 426 HEMI cars