Questions about an Abody 8 3/4

Everybody seems to call them "posi", even some dyed in the wool Mopar people. Take the measurements that crackedback has for you, and then spin either axle and make sure the other axle is spinning the SAME way. If it's not spinning the same way or not spinning at all, it is an open center, if it spins the same way, it's a suregrip. Being it's a 489 case and from a 70 car, it's most likely gonna be an Auburn "cone" style suregrip. How much is the asking price??? Geof