Is this any good or will it work for my 73 duster?

I was searching around craigslist and came across this 8.75 rear end. Please forgive my ignorance on the matter but i need to know if this is a decent rear end for the price and if it will even fit my 73 duster. I need schooling in center sections, he has 2, what one is better for a built 360 around 400 hp?

http://orangecounty.craigslist.org/pts/1525770258.html

thanks,

Bryce