I have just put a 360 into my 70 Dart where a slant 6 225 used to reside. I have a B-body rear that I would like to replace the existing small rear. I kow that it is 3" longer and I must relocate the springs. Do I have to shorten the rear or can it be used as is? Can anyone lead me to a tech article that addresses this issue or give me a step by step approach to this problem? Any help would be greatly appreciated! Thanks from Gospel Runner.