Jeff
Group 0.439 COVER, Valve Push Rod 37-49 all vehicles, and 50-53 all vehicles with 216 engine - tall side cover
50-53 all vehicles except those equipped w/216 - short side cover
This, as our Canadian members will tell us, is not the case with 50-53 216 engines (which had short side covers).
The casting number will clear up any and all questions. Maybe..