Entire Hub & Drum Assemblies WERE available, but no company has made them in over 40 years....
.....I had some N.O.S. Front Hub & Drums as recently as about 7 - 8 years ago, but they are all Sold now....
I do have N.O.S. 11" x 3" Front Drums U.S.A. made
(Big Block) &
I do have N.O.S. 10" x 2 1/2" Front Drums U.S.A. made
(Small Block) &
As correctly pointed out above, the 383 could go both ways , so if 10" then 10" & if 11" then 11".....
I also have N.O.S. ++ Asbestos ++ Brake Shoes --- the softest, smoooooothest braking system known to mankind, and such that you don't rip up Brake Drums to smithereens....
I have also Wheel Cylinders, Brake Hoses, Brake Hardware, Emergency Brake Cables, and Wheel Bearings & Seals.....
As per forum rules, P.M. me if interested......
Yours, Craig....