Ford Ranger rear end fit '71 Dart?

I made it out of 4x4s; stacked up enough to clear the pumpkin. Then I use toothpicks if the perches need spaced up on either side. I also check to make sure the perches are centered front to back. I measure from the centering hole to the edge of the perch to make sure they're the same; then to the edge of the tube. I'll grind the edge of the perch if they're different. By using the 4x4s, I can put them in place and know they won't move on me when my wire hits. I reuse the perches because new ones aren't accurate anyway on an old housing. The 4x4s also help to verify that the perch heights are the same.