Suspension rebuild and disc brake swap...by a noob for noobs

Before I move on to the front end, here's the parts list for the rear end swap:

• 8 1/4" rear end with u-bolts, shock plates and drive shaft, B&B Salvage (off a '74 Valiant)
• leaf springs and bushings, ESPO
• shock absorbers RockAuto
• differential cover gasket, Pep Boys
• rubber gear case bumper, Silke's
• Gorilla "acorn" lug nuts #41187HTB, Amazon
• Gear oil, Pep Boys
• 10" backing plates, struts, and parking brake levers, B&B salvage (off a '70 Satellite)
• 10" drums, jet.com
• shoes, RockAuto
• Wheel cylinders, RockAuto
• drum brake spring kit, RockAuto (one kit covers right and left)
• self-adjusting hardware kits, RockAuto (separate kits for right and left)
• 25' of nickel-copper brake line, Amazon

That list does not include the rims and tires. Some notes on parts:

• When you go to a larger differential you'll need a shorter drive shaft. I guessed the donor car's drive shaft would be the right length because it came off a 74 Valiant 4-door which has the same 111" wheelbase as the '74 Dart. I was right but unfortunately it was bent. I ended up taking my existing driveshaft to be shortened at a driveshaft shop.
• You need new lug nuts because LBP uses 1/2" threads, but SBP uses 7/16".
• Gorilla lug nuts come in packs of 4, so you need 5 packs.
• The rubber bumper is what people sometimes call a pinion snubber.
• New rear wheel cylinders come with smaller bleeder screws with 7mm hex. If you can find some good used ones I'd recommend rebuilding them instead of replacing.