How do you remove rear leaf spring bushings on 67 camaro?

If you have access to a press, pressing them out would be the best way. You will need the spring removed from the car. Another way (but messy) is to burn the rubber out of the bushing then remove the steel collar with a hammer and chisel. But installing them would be best done with a press.

Burning the rubber out is the easiest way to remove the bushings if you do not have air tools. Depending on where you live this is a very hostile environment and the leafs have been down there for a long time. People in dry states usually have a better time at this but for those in the midwest and other rust belt states you could be asking for trouble. The perch that the leafs sits in (front) is usually very rusty and held together just for the fact the leafs are still there. So be prepared for this malady when you get ready to change them. when the leafs are down the new ones can be located by the pin location on the new set of leafs. just set them in the pin hole and bolt them up. Do the front first and then go to the rear keeping in mind that a jack my be needed to raise the rear of the leaf to the shackle. Good luck!