1. Drive slowly in the snow. There are always idiots out there who think they can still do 10 over the speed limit and they will, right up until they end up in a ditch or wedged under the bumper of a semi.
2. Get good tires. If you have bald tires no amount of 4 wheel drive, locking diffs or driver skill is going to save you. A set of dedicated snow tires are best but a good set of all terrain or all season tires will work well enough. The BFG KO2 is actually rated as a snow tire, also a great all around tire.
3. Salt sucks. It will turn your pristine 80 into a rust bucket in no time at all. Lots of good answers here for how to deal with it. There are shops that do undercoatings of various types can be pricy but effective. Alternatively, after an oil change use an old rag so spread the oil oil over everything on the underside of the 80, this is messy, smells bad, and a minor environmental disaster but very effective at preserving the metal.
As far as ABS, its definitely detrimental to an experienced driver in the snow but I think its useful to someone not used to driving in the white stuff. Go experiment with this, its a lot of fun doing donuts in an empty parking lot and it makes you a better driver.