66 273 radiator/fan shroud dimentions

I have two 66 Barracudas originally sold in CA. Both were 273 non A/C cars and both had the factory installed fan shroud. Build sheets for both show the shroud as build equipment.
Just wondering if a CAP (clean air package) called for a shroud on all CA 66's w/273, not just the A/C cars?
My CA 66 Dart GT w/273 non AC had the shroud