What Rear End Is This??

Only the 360 cars got disc brakes and then the LBP standard that year, it was an option on all the other cars. Drums on the front mean SBP. So somewhere down the road the original rear gave up and somebody swapped it with a rear from a 73 up a body with disc brakes. They were probably stunned themselves when they got it all together and realized it was a different pattern. It could have come out of an identical looking 74 just with front discs. Too bad they didn't take the front brake setup when they were taking the rear axle.