I see something that is puzzling and cool at the same time... Large bolt pattern rallyes and an 8 3/4 rearend in a '74? Did you put the rearend in the car or was it in there?
The rear end was in it when I bought the car. I am not very smart when it comes to the rear end. I know it has a 489 case. I'm not sure why someone would replace the original with this one as the rest of the car appeared all original when I bought it. How would I know if it was a ford rear? All the time I have driven it, it has performed well.