67 charger Rear end?

Are you putting it in the Valiant in our avatar? If so, and assuming you currently have the stock 7.25, relocate the spring purches, get another driveshaft or have yours shortened, and you'll need some u-bolts and shock plates for 8.25 or 8.75. Depending on which size rear axle yoke you have, you may need a conversion u-joint as well.