Until the brake drums approach the maximum diameter (usually .060" oversize for cars, and .090" for trucks) there's no necessity to radius-grind linings. I grew up around a shop where we had the capability to grind brake linings, but we did it very rarely. Contrary to popular opinion, the linings were not matched to drum diameter, but they were actually ground to a slightly smaller radius so the center of the shoe would come into contact with the drum first. As pressure was applied to the shoes, the drum would flex slightly, and it would come into full contact for the whole length of the lining. A lining that's ground to the diameter of a standard drum will work a little better, not worse, in a slightly oversize drum. I'd suggest finding an old school brake shop, and see if they will take the time and effort to do a true-up on the drums with a mimimum cut. I'd be surprised if they need to make more than a .020" increase in diameter.
Jerry
