I just found a 12 bolt rear end for sale for $150. The ower claims it is out of an Elcamino has 3:73's, and is posi. Is this a good deal? What should I be looking for other than both wheels turning in the same direction? I am going to look at it tomorrow afternoon. How can I tell if it has 3:73's, is posi, is a 12 bolt, and not a wornout mess? Is this a good deal? I need to build a rear for my 63 that I am doing a medium tub on now so I am not worried about the width. Any help would be very appreciated since I know very little about this topic.