I purchased a very original 67 400 and one of the few things that was changed by the previous owner was replacing the original monoleafs with multileafs. I wish they hadn’t of done it. You have to use shackles with the multileafs which forced them to bend the original brake lines away from the differential and from under the stock brackets. The emergency brake cable no longer goes into the original bracket. The stance of the car looks no different than cars with monoleafs. I will probably replace them with replacement reproduction monoleafs.