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Athearn's Large ACF Covered Hopper Athearn/Bev-Bel's ACF Large Covered Hopper...
Athearn makes a four bay ACF large covered hopper that is not a match for any Chessie class.  I would not recommend purchasing this kit as part of a prototype Chessie railroad.  I would recommend the Accurail three bay ones.  The Accurail kit is dead on for a Chessie covered hopper.  

Below is a real pic of the ACF large covered hopper.  It is a Dean Heacock pic.

                                             Dean Heacock photo

Below are my Athearn/Bev-Bel covered hoppers.  I bought these kits very early in my Chessie modeling, and I just did not know any better.  I just assembled them and weathered them.  I have since retired both these cars.