Ok, I crawled under my 54 and took a measuring stick with me. On my 54, I currently have the OE 62" rearend, 6" wide rims, 4.25 backspace, and 225/75/16 Goodyear SRA tires. So, there is 1.25" before the tire gets into the bed side and 2" on the fender side. With that being said, it stands to reason, you'll n
eed wheels that have 3.5-3.75 backspace and you'll have to mind your tire width.
Onto the Shock/Spring mounting. If you're going to use the original springs, you'll need a 1.75 spring perch, U bolts, and plate that fit an 8.8 and also shock mounts. Early Jeeps had 1.75 leaf springs, so the 4x4 guys have you covered there. Also, you can look at trailer parts to get what you need. Get some weld on shock mounts and put them where you want, since you'll be welding on new perches anyhow.
https://www.morris4x4center.com/perc...or-war175.html
https://www.etrailer.com/Accessories...e/TRSS300.html
https://www.etrailer.com/Accessories...RTP300200.html
https://www.ruffstuffspecialties.com...ARLY-UPLT.html
https://www.ruffstuffspecialties.com...SBRKT-CUR.html