Is this a good price/deal? (NOT MINE)

I wouldn't say "useless" but unless you want to run a 2.45 gear, you're going to have to find another carrier and although the rear axle housing will fit an A body, it's actually 1/2" too wide meaning you'll have to spread the springs apart to get it in. Plenty of people have done it, but it's really not correct. Lastly, although I know it can be put in an A body, I don't know how the overall length compares. The 2.54 carrier would be enough right there for me to quit lookin "at that".