Motorcycle Repair: rear wheel replacement, drum brake, disc brake

Question
72 shovel custom,want to replace the rear drum brake and wheel ass. with newer mag and disc brake setup,16x3? any suggestion?

Answer
You can replace the rear wheel with a newer type. Just remember to space it on both sides. The spacing is different. As to the brake, you are going to have to shop around and find a caliber that will mound to your frame, since that frame never had a disk brake.
Good luck and happy riding
Mike