For a car that sees street duty, it's a good idea to go with the big bearing housing ends but for a race car, the small bearing ends will work fine especially if you want to stay with 10" drums which won't work with the big bearing ends. The 11" drums for the big ends are too heavy. If you want to go to rear discs, then the big bearing ends might be better.
We just use the small bearing ends with drums on the stocker. Looks like Pond might have the same:
How's your Shelby project coming along?