Yeah I don't like the grinding idea... You'll definitely own them then! Here is the SS brake kit I was thinking of. Application shows 75-86 trucks, and I'm not sure what it would take to make them work with your axle. It could just be the brake line fitting... I know you wanted slotted and drilled and these are solid. I'd call Stainless Steel brakes and see if they sell a rotor that would work with the kit.
http://www.summitracing.com/parts/SSB-A126/