Everything everyone has said about the 9" taking away more power then a Dana has been the exact opposite of what I have heard in the pass. But maybe the person that told me was confused or something and passed me a bad apple.
I have to agree with Ace here. An 8 3/4 well built will handle your application and save weight. That is what I am planning for the Dart and I plan to stick to it.
Adam you are more then welcome to come down to WV and take your pick. I have 2 Dana 60s and 3 8 3/4s and 2 Ford 9 inches. Dont have any Chevy rears cause, well, a 7 1/4 would hold up to the power they make haha.