Early A Body fan shroud EBAY Link

Oklacarcollecto said
The real question is was there a factory 22" radiator made for the 65/66 a-body with a /6 in it?

Yes. Here are the A-body shroud p/ns-

1965 slant-6 + 1966 slant-6 w/o A/C or CAP, w/19" radiator core:
Upper: 2524 501. Lower: 2524 508

1966 slant-6, w/A/C or CAP, w/22" radiator core: 2785 127

1964, 1965 & 1966 V8:
Upper: 2524 306
Lower: 2524 313

1964 Slant-6 (ring-style shroud, not box type):
Upper: 2417 435
Lower: 2417 442