Couple of questions ...

yes these men gave u . 2+2 advice. weights on all mopar parts are 2 balance that product. ie that part. then they all work together. drive shafts that takes internal trans repacing. the one you need to measure is miss matched look and u can find . or stop have custom made. slip joint were on all early mopars .late 64 all 65 had slip joints . to get 63 or some . u have a miss matched stuff.