Depending on what gear ratios you run you sometimes have to grind most of the support for the pilot bearing away to clear the ring gear teeth. Stock housings are good to about 350 lb/ft on most heavy American cars. Not sure how much they would hold with a light Z chassis. If you're looking for serious power and drag racing style shock loading, you're going to have to replace most of what is in a 9", the third member housing, pinion support, yoke, axle shafts, etc. 9 inches are great because they're so commonly used that you can find all kinds of cool hop up parts cheap, but a stock 9" out of an old Ford car especially is not the greatest diff by a long shot.
That said I don't think a Dana 60 is the right choice for our lightweight cars either. In my opinion a built 9", 12 bolt, or even an 8.8 should do fine for most of our drag racer project cars.
What exactly is a ring gear snubber? Never heard of that one. I know what a pinion snubber is, although how it would relate to installing a 9" in a Z is a mystery to me unless someone was to go with leaf springs...