Neither of those cars are jack up by artificial means, both have the orignal 440/hemi suspension although the 68 has an extra leaf added to the stack back in the day. Neither scrubb even in off camber situations. The back space is the key, one of the reasons I said I would prefer 4.25 over the 3.75s. The rake is due to not having enough height in either the tortion bars and I probably give up an inch just in the front tire height compared to the rear.