1965 Dodge Dart stock differential advice

Looks awesome. For my latest build Dart Charger I have bought NOS bearings and shims for around usd 250. Then a new 3.23 gear ratio in NOS box for another usd150. I just bought new seals and gasket. Took me 6 month.

I bought factory stuff for quality purpose.
I never really considered accumulating NOS stuff. That's a possibility.