That shows you how little I know about this conversion.
Obviously the brake shoes got a lot wider over time.

Make some measurement of your rear axle then go to your FLAPS and ask to measure their Raybestos 5014R.
This rotor came up in discussions of a Dana conversion.
It would require replacing the old lugs with longer ones.
Attachments
Drum Comparison.jpg (75.82 KB, 237 downloads)

"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."