Brake Drums and Hubs

[69z2x4]

My 69 Camaro came with disk brakes originally but was changed over to drum brakes because it was a drag car from new and that was a common practice back then to save a few pounds. The RS front was changed out as well. There is a cast date of F 11 8 on the drums and appear to be two peace..Did they have two peace drum and hubs at that date? Tks