Here is a good post for swapping into an A body. You probably can use most of the info and adjust accordingly for a B. I looked into this for an e body but I decided to stick with the 8 3/4 and upgrade the rear brakes to disc in the future. I will use the mopar action Jeep Liberty parts write up and save 50lbs over the drums... and also keep it all mopar. https://www.forabodiesonly.com/mopar/threads/8-8-swap.89918/