Vintage air 65 dart

it depends on what "level" you want to go with. meaning:

do you want to replace 100% of your OE components?
want to keep your OE Ac Box and Controls?
Want to replace just the lines and compressor?

I can tell you this from experience, its going to cost between 1000 & 1500 to either completely replace with a Classic Air or Vintage Air system, or restore/rebuild using all OE stuff..

I'm restoring the OE components on my 70 Coronet R/T and my Wife's 75 Duster right now. Its been a LONG process tracking down some stuff, and I'm hoping it'll be worth it in the end (I'm going to use R12 though and not retrofit)