8-3/4 Vs Dana60 Vs 9" Rear
Sorry to say I'm partial to the 8.75, probably because I have three of them, one apart on my bench getting new gears even as we speak. Everything is a compromise of some sort in this dept. But I believe the 8.75 is the best compromise for an A-body for all the reasons already mentioned. Your total car weight is not going that high (3klbs?), and they can be built without much effort to become nearly indestructible. Put some Mark Williams caps with housing brace bolts, back brace, thicker axle tubes, etc. and it will do anything you can imagine under an A-body. More efficiently and at a lower weight.