Drive shaft help

Hey guys new to the forum my dad had a 72 dodge dart car had a 318 witha 904 trans in it. He has built a 416 stroker motor for the car and
Is looking to put a tf 727 in it now we know his drive shaft has to be cut and the slip yoke changed this is a custom made mark Williams drive shaft. 20190515_203330.jpg 20190828_200750.jpg 20190317_182901.jpg anything else you guys can think of that needs to be changed? What's the ujoint size difference any one no?