As far as I know the factory never provided over size specs for brake drum turning in this period. I just looked through all the stuff I had to make sure I did not have anything. This wigs out the people like Les Schwab because they don't want to touch an Item where there is no dimensional trail due to corporate wimpy-ness.
My father-in-law took his 1960 half ton into get an oil change to one of these corporate oil change outfits and they said they couldn't change the oil as it was not in their computer.
A general thumb max oversize is .12 so between .080 and .12 You may have to take it to a machine shop or a small shop who is less ridged Nobody makes the drums anymore that are riveted to the hubs.
That dimension may be a little conservative but was provided to me from a reliable source. Considering that most of your stopping power is in the front of the truck and the big 11 inch brakes are in the back I would be comfortable on my own truck going beyond that on the back especially if you are the driver and you don't really carry any loads. These trucks in the days usually traveled about 35 miles an hour maybe 45 or 50. Basically if you were to over size and noticed brake fade you have likely gone too far.
Les Schwab will size your drums for you though. And I would consider marking each one as he does so as to not confuse them.
I have considered replacing the drums by grinding out the rivets on the hubs and using later drums and just bolting them on like modern drums but you would have to make sure the hub diameter, bolt pattern, drum dia and width are the same. Maybe a later Dodge D100 drum? I would imagine if you were to come up with a substitute drum you would also have to match it to the hub by having it turned on that hub.
These guys will take your drum shipment, turn the drums and provide new arched linings for a perfect fit but don't count on them to cut the drums more than .120
Brake drum over size. If you do ship your drums be sure and have them sized before you should ship them.
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