Dana 60 with upgraded slant six

Not sure how much the 8.75s you're looking at cost but they are generally way cheaper than the dana60. That's assuming you're talking about buying the rear-end and installing it directly in an a body. Truck rears are cheap but you spend lots to get it in your car...

Price all that darter6 suggested. Unless I'm missing something you can find a bolt in ready 8 3/4 with good gear and sure grip cheaper. Also I can carry an 8.75 by myself but not trying a 60 at this point in my life. As Dan pointed out lot a unnecessary weight but a slant won't break it.