for what it's worth new 10 x 1 3/4" drums are avail. and are cheap.
the original rear drums w/front discs is matched and works good.
...but modern new stuff if dialed in can be nice
And for a DD, in Canada, those are waaaay more than adequate, cuz the P-valve will cut some 70% of the pressure to the rears anyhow. Shoot,10 x 1 would probably be enough, for a DD.Maybe even less.....
But if you're cruisin high-speed, well,I can't speak to that, cuz here the speed limit is mostly 100, occasionally 110KPH