8 3/4 or Dana 60

I'm sure you'll get opinions that with 400hp there is no need for a Dana, but what happens when you decide to go even bigger later. If you go Dana now, you won't have to ask the question later. I would think if you threw the 741 case w/3.23 open gear in it and it's complete small bolt pattern A-body 8 3/4 from drum to drum, you should be able to get $500-$600 for it.

Don't believe the hype about the Dana being so much heavier and your car being slower. The most it will cost you is 1/10 sec.