Oval -vs- Round 1970 chevlle bushings

[Yenko68]

I have a 70 chevelle and want to rebuild the suspension. The problem is that I hear that some chevelle used and oval bushings and some use round. What year did this change and where exactly was it used. I read that the lower control arm is where they are and one site mentioned the rear arms by the rear end. It looks around 1970 they changed it. This is my first Chevelle. From now on I will stick with my Camaros and Novas.

[70 chevelle]

The oval bushing or round bushing is in the lower control arm. The bushing toward the front of the car is always round. The busing toward the rear of the control arm can be oval or round. The oval bushing looks like this
http://i148.photobucket.com/albums/s37/tonylav/DSC01098.jpg