Well B bodies from 74 up as well as C bodies did have the 9.25 available, I've got one in my sig car. Seems to me it'd be much cheaper and easier to score one of those and put it in. If you're going through the time, money and hassle of converting a truck rear end over for your car, you might as well get a junkyard Dana 60 from a truck and convert that over. That effort on a 9.25 wouldn't really be worth it.