i drove a z28 with bald summer tires in the winter for a month, and that was ridiculous but fun. also had a fc with summer tires, rwd bonneville, and 2wd blazer. they were all completely fine.
depending on the weight of the car, tires, and whether you have a lsd, you might get stuck easier in deep snow with rwd, but from a driving dynamics perspective rwd is much better in the snow than fwd if you know what you are doing.